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Class 11 Mathematics - Sets - Venn Diagrams Expert Quiz

Level 13 • 50/50 questions • 25 seconds per question.

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Time Left 20:50 25 sec/question
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एक सर्वे में (n(U)=120), (n(A)=62), (n(B)=55) और (n\(A\cup B\)=91) है। वेन आरेख के अनुसार (n\(A\cap B\)) कितना होगा?

In a survey (n(U)=120), (n(A)=62), (n(B)=55) and (n\(A\cup B\)=91). According to the Venn diagram, what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (26)

Step 1

Concept

Using (n\(A\cap B\)=n(A)+n(B)-n\(A\cup B\)), the answer is (26). In exams, find the intersection this way when the union is given.

Step 2

Why this answer is correct

The correct answer is A. (26). Using (n\(A\cap B\)=n(A)+n(B)-n\(A\cup B\)), the answer is (26). In exams, find the intersection this way when the union is given.

Step 3

Exam Tip

सूत्र (n\(A\cap B\)=n(A)+n(B)-n\(A\cup B\)) से उत्तर (26) है। परीक्षा में संघ का मान मिलने पर प्रतिच्छेद इसी तरह निकालें।

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एक सर्वेक्षण में (n(U)=180), (n(A)=82), (n(B)=76), (n(C)=69), (n\(A\cap B\)=34), (n\(B\cap C\)=29), (n\(C\cap A\)=27) और (n\(A\cap B\cap C\)=12) है। किसी भी समुच्चय में न आने वालों की संख्या कितनी है?

In a survey (n(U)=180), (n(A)=82), (n(B)=76), (n(C)=69), (n\(A\cap B\)=34), (n\(B\cap C\)=29), (n\(C\cap A\)=27) and (n\(A\cap B\cap C\)=12). How many are in none of the sets?

Explanation opens after your attempt
Correct Answer

A. (31)

Step 1

Concept

(n\(A\cup B\cup C\)=82+76+69-34-29-27+12=149), so outside is (180-149=31). First find the union and then take the complement.

Step 2

Why this answer is correct

The correct answer is A. (31). (n\(A\cup B\cup C\)=82+76+69-34-29-27+12=149), so outside is (180-149=31). First find the union and then take the complement.

Step 3

Exam Tip

(n\(A\cup B\cup C\)=82+76+69-34-29-27+12=149), इसलिए बाहर (180-149=31) है। पहले संघ निकालें फिर पूरक लें।

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किसी कक्षा में (n(U)=80), (n(A)=37), (n(B)=42) और (n\(A\cap B\)=19) है। केवल (A) में आने वाले विद्यार्थियों की संख्या कितनी है?

In a class (n(U)=80), (n(A)=37), (n(B)=42) and (n\(A\cap B\)=19). How many students belong only to (A)?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

The only (A) part is (n(A)-n\(A\cap B\)=37-19=18). In a Venn diagram, the common part should not be counted twice.

Step 2

Why this answer is correct

The correct answer is A. (18). The only (A) part is (n(A)-n\(A\cap B\)=37-19=18). In a Venn diagram, the common part should not be counted twice.

Step 3

Exam Tip

केवल (A) का भाग (n(A)-n\(A\cap B\)=37-19=18) है। वेन आरेख में साझा भाग को दोबारा नहीं गिनना चाहिए।

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यदि केवल (A) में (21), केवल (B) में (24), केवल (C) में (18), केवल \(A\cap B\) में (13), केवल \(B\cap C\) में (11), केवल \(C\cap A\) में (9) और तीनों में (7) तत्व हैं, तो ठीक दो समुच्चयों में आने वाले तत्वों की संख्या कितनी है?

If only (A) has (21), only (B) has (24), only (C) has (18), only \(A\cap B\) has (13), only \(B\cap C\) has (11), only \(C\cap A\) has (9), and all three have (7) elements, then how many elements are in exactly two sets?

Explanation opens after your attempt
Correct Answer

A. (33)

Step 1

Concept

Exactly two sets include only the pairwise-only regions, so (13+11+9=33). Do not count the centre \(A\cap B\cap C\) in exactly two.

Step 2

Why this answer is correct

The correct answer is A. (33). Exactly two sets include only the pairwise-only regions, so (13+11+9=33). Do not count the centre \(A\cap B\cap C\) in exactly two.

Step 3

Exam Tip

ठीक दो समुच्चयों में केवल दो-दो वाले क्षेत्र आते हैं, इसलिए (13+11+9=33) है। केंद्र \(A\cap B\cap C\) को ठीक दो में न गिनें।

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यदि (n(U)=150), (n(A)=70), (n(B)=65) और (n\(A\cap B\)=28) है, तो (n(\(A\cup B\)')) कितना है?

If (n(U)=150), (n(A)=70), (n(B)=65) and (n\(A\cap B\)=28), then what is (n(\(A\cup B\)'))?

Explanation opens after your attempt
Correct Answer

A. (43)

Step 1

Concept

First (n\(A\cup B\)=70+65-28=107), so the outside part is (150-107=43). Remember to subtract from the universal set for a complement.

Step 2

Why this answer is correct

The correct answer is A. (43). First (n\(A\cup B\)=70+65-28=107), so the outside part is (150-107=43). Remember to subtract from the universal set for a complement.

Step 3

Exam Tip

पहले (n\(A\cup B\)=70+65-28=107), इसलिए बाहर का भाग (150-107=43) है। पूरक निकालते समय सार्वत्रिक समुच्चय घटाना याद रखें।

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यदि (n(A)=4x+5), (n(B)=3x+8), (n\(A\cap B\)=2x+1) और (n\(A\cup B\)=72) है, तो (x) का मान क्या होगा?

If (n(A)=4x+5), (n(B)=3x+8), (n\(A\cap B\)=2x+1) and (n\(A\cup B\)=72), then what is the value of (x)?

Explanation opens after your attempt
Correct Answer

A. (12)

Step 1

Concept

Using the formula, (72=(4x+5)+(3x+8)-(2x+1)=5x+12), so (x=12). In algebraic Venn questions, apply the union formula directly.

Step 2

Why this answer is correct

The correct answer is A. (12). Using the formula, (72=(4x+5)+(3x+8)-(2x+1)=5x+12), so (x=12). In algebraic Venn questions, apply the union formula directly.

Step 3

Exam Tip

सूत्र से (72=(4x+5)+(3x+8)-(2x+1)=5x+12), इसलिए (x=12) है। बीजगणितीय वेन प्रश्न में संघ का सूत्र सीधे लगाएँ।

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तीन समुच्चयों के लिए (n(A)=48), (n(B)=50), (n(C)=44), (n\(A\cap B\)=20), (n\(B\cap C\)=18), (n\(C\cap A\)=16) और (n\(A\cap B\cap C\)=7) है। (n\(A\cup B\cup C\)) कितना होगा?

For three sets (n(A)=48), (n(B)=50), (n(C)=44), (n\(A\cap B\)=20), (n\(B\cap C\)=18), (n\(C\cap A\)=16) and (n\(A\cap B\cap C\)=7). What is (n\(A\cup B\cup C\))?

Explanation opens after your attempt
Correct Answer

A. (95)

Step 1

Concept

By the formula, (48+50+44-20-18-16+7=95). In three sets, the common triple part must be added back.

Step 2

Why this answer is correct

The correct answer is A. (95). By the formula, (48+50+44-20-18-16+7=95). In three sets, the common triple part must be added back.

Step 3

Exam Tip

सूत्र से (48+50+44-20-18-16+7=95) मिलता है। तीन समुच्चयों में अंतिम साझा भाग को वापस जोड़ना जरूरी है।

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यदि \(U={1,2,\ldots,60}\), (A) (3) के गुणजों का समुच्चय और (B) (4) के गुणजों का समुच्चय है, तो (n(\(A\cup B\)')) कितना होगा?

If \(U={1,2,\ldots,60}\), (A) is the set of multiples of (3) and (B) is the set of multiples of (4), then what is (n(\(A\cup B\)'))?

Explanation opens after your attempt
Correct Answer

A. (30)

Step 1

Concept

Multiples of (3) are (20), multiples of (4) are (15), and multiples of (12) are (5), so the union is (30) and the complement is (60-30=30). Subtract common multiples once.

Step 2

Why this answer is correct

The correct answer is A. (30). Multiples of (3) are (20), multiples of (4) are (15), and multiples of (12) are (5), so the union is (30) and the complement is (60-30=30). Subtract common multiples once.

Step 3

Exam Tip

(3) के गुणज (20), (4) के गुणज (15), और (12) के गुणज (5) हैं, इसलिए संघ (30) और पूरक (60-30=30) है। साझा गुणजों को एक बार घटाएँ।

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यदि (n\(A\cap B\cap C\)=9), केवल \(A\cap B\) में (14), केवल \(B\cap C\) में (11), और केवल \(C\cap A\) में (13) तत्व हैं, तो (n(\(A\cap B\)\cup\(B\cap C\)\cup\(C\cap A\))) कितना है?

If (n\(A\cap B\cap C\)=9), only \(A\cap B\) has (14), only \(B\cap C\) has (11), and only \(C\cap A\) has (13) elements, then what is (n(\(A\cap B\)\cup\(B\cap C\)\cup\(C\cap A\)))?

Explanation opens after your attempt
Correct Answer

A. (47)

Step 1

Concept

Elements in at least two sets are (14+11+13+9=47). In the Venn diagram, count the centre only once.

Step 2

Why this answer is correct

The correct answer is A. (47). Elements in at least two sets are (14+11+13+9=47). In the Venn diagram, count the centre only once.

Step 3

Exam Tip

कम से कम दो समुच्चयों में आने वाले तत्व (14+11+13+9=47) हैं। वेन आरेख में केंद्र को एक बार ही गिनें।

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एक सर्वे में (n(U)=200), (n\(A\cup B\cup C\)=164) है। किसी भी समुच्चय में न आने वालों की संख्या कितनी है?

In a survey (n(U)=200), (n\(A\cup B\cup C\)=164). How many people are in none of the sets?

Explanation opens after your attempt
Correct Answer

A. (36)

Step 1

Concept

None of the sets is (n(\(A\cup B\cup C\)')=200-164=36). The outside region is always total universal set minus the union.

Step 2

Why this answer is correct

The correct answer is A. (36). None of the sets is (n(\(A\cup B\cup C\)')=200-164=36). The outside region is always total universal set minus the union.

Step 3

Exam Tip

किसी में नहीं (n(\(A\cup B\cup C\)')=200-164=36) है। बाहर का क्षेत्र हमेशा सार्वत्रिक समुच्चय से संघ घटाकर मिलता है।

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यदि (n\(A\cup B\)=76), (n(A-B)=31) और (n(B-A)=27) है, तो (n\(A\cap B\)) कितना होगा?

If (n\(A\cup B\)=76), (n(A-B)=31) and (n(B-A)=27), then what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

The union is the sum of three disjoint parts, so the intersection is (76-31-27=18). For region-based questions, split the Venn diagram into parts.

Step 2

Why this answer is correct

The correct answer is A. (18). The union is the sum of three disjoint parts, so the intersection is (76-31-27=18). For region-based questions, split the Venn diagram into parts.

Step 3

Exam Tip

संघ तीन अलग भागों का योग है, इसलिए प्रतिच्छेद (76-31-27=18) है। क्षेत्र आधारित प्रश्नों में वेन आरेख को भागों में बाँटें।

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वेन आरेख में (A) के केवल भाग में (23), (B) के केवल भाग में (17), (C) के केवल भाग में (19), केवल दो-दो के भागों में (8,9,10) और केंद्र में (5) हैं। (n\(A\cup B\cup C\)) कितना है?

In a Venn diagram, only (A) has (23), only (B) has (17), only (C) has (19), the only two-set regions have (8,9,10), and the centre has (5). What is (n\(A\cup B\cup C\))?

Explanation opens after your attempt
Correct Answer

A. (91)

Step 1

Concept

The union is the sum of all disjoint inside regions (23+17+19+8+9+10+5=91). Add each separate region exactly once.

Step 2

Why this answer is correct

The correct answer is A. (91). The union is the sum of all disjoint inside regions (23+17+19+8+9+10+5=91). Add each separate region exactly once.

Step 3

Exam Tip

संघ सभी अंदरूनी अलग क्षेत्रों का योग (23+17+19+8+9+10+5=91) है। अलग क्षेत्रों को एक-एक बार जोड़ना सही तरीका है।

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यदि \(A\subseteq B\), (n(A)=32), (n(B)=57) और (n(U)=90) है, तो (n(B-A)) कितना होगा?

If \(A\subseteq B\), (n(A)=32), (n(B)=57) and (n(U)=90), then what is (n(B-A))?

Explanation opens after your attempt
Correct Answer

A. (25)

Step 1

Concept

Since \(A\subseteq B\), (B-A) has (57-32=25) elements. In subset diagrams, the smaller circle lies inside the larger one.

Step 2

Why this answer is correct

The correct answer is A. (25). Since \(A\subseteq B\), (B-A) has (57-32=25) elements. In subset diagrams, the smaller circle lies inside the larger one.

Step 3

Exam Tip

क्योंकि \(A\subseteq B\), इसलिए (B-A) में (57-32=25) तत्व होंगे। उपसमुच्चय वाले आरेख में छोटा वृत्त बड़े के भीतर होता है।

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यदि \(A\cap B=\varnothing\), (n(A)=41), (n(B)=39) और (n(U)=100) है, तो (n(\(A\cup B\)')) कितना है?

If \(A\cap B=\varnothing\), (n(A)=41), (n(B)=39) and (n(U)=100), then what is (n(\(A\cup B\)'))?

Explanation opens after your attempt
Correct Answer

A. (20)

Step 1

Concept

For disjoint sets, (n\(A\cup B\)=41+39=80), so the complement is (20). When sets are disjoint, take the intersection as zero.

Step 2

Why this answer is correct

The correct answer is A. (20). For disjoint sets, (n\(A\cup B\)=41+39=80), so the complement is (20). When sets are disjoint, take the intersection as zero.

Step 3

Exam Tip

असंबद्ध समुच्चयों में (n\(A\cup B\)=41+39=80), इसलिए पूरक (20) है। असंबद्ध होने पर प्रतिच्छेद शून्य मानें।

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किसी परीक्षा में (120) विद्यार्थियों में से (72) गणित, (64) भौतिकी और (38) दोनों पढ़ते हैं। केवल एक विषय पढ़ने वालों की संख्या कितनी है?

In an exam group of (120) students, (72) study Mathematics, (64) study Physics and (38) study both. How many study exactly one subject?

Explanation opens after your attempt
Correct Answer

A. (60)

Step 1

Concept

Exactly one subject is ((72-38)+(64-38)=60). For exactly one, subtract the common part from both sides.

Step 2

Why this answer is correct

The correct answer is A. (60). Exactly one subject is ((72-38)+(64-38)=60). For exactly one, subtract the common part from both sides.

Step 3

Exam Tip

केवल एक विषय ((72-38)+(64-38)=60) है। ठीक एक में साझा भाग को दोनों तरफ से घटाएँ।

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यदि (n(A)=45), (n(B)=52), (n\(A\cup B\)=73) है, तो (n\(A\triangle B\)) कितना होगा, जहाँ \(A\triangle B=(A-B)\cup(B-A)\)?

If (n(A)=45), (n(B)=52), (n\(A\cup B\)=73), then what is (n\(A\triangle B\)), where \(A\triangle B=(A-B)\cup(B-A)\)?

Explanation opens after your attempt
Correct Answer

A. (49)

Step 1

Concept

First (n\(A\cap B\)=45+52-73=24), then (n\(A\triangle B\)=73-24=49). The symmetric difference excludes the common part.

Step 2

Why this answer is correct

The correct answer is A. (49). First (n\(A\cap B\)=45+52-73=24), then (n\(A\triangle B\)=73-24=49). The symmetric difference excludes the common part.

Step 3

Exam Tip

पहले (n\(A\cap B\)=45+52-73=24), फिर (n\(A\triangle B\)=73-24=49) है। सममित अंतर में साझा भाग शामिल नहीं होता।

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यदि (n(U)=110), (n(A)=58), (n(B)=49) और (n(A-B)=21) है, तो (n(\(A\cup B\)')) कितना है?

If (n(U)=110), (n(A)=58), (n(B)=49) and (n(A-B)=21), then what is (n(\(A\cup B\)'))?

Explanation opens after your attempt
Correct Answer

A. (24)

Step 1

Concept

(n\(A\cap B\)=58-21=37), so (n\(A\cup B\)=58+49-37=70) and outside is (110-70=40). Check calculations carefully to avoid option traps.

Step 2

Why this answer is correct

The correct answer is A. (24). (n\(A\cap B\)=58-21=37), so (n\(A\cup B\)=58+49-37=70) and outside is (110-70=40). Check calculations carefully to avoid option traps.

Step 3

Exam Tip

(n\(A\cap B\)=58-21=37), इसलिए (n\(A\cup B\)=58+49-37=70) और बाहर (40) नहीं बल्कि (110-70=40) होगा। सही विकल्पों में त्रुटि से बचने के लिए गणना जाँचें।

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यदि (n(U)=110), (n(A)=58), (n(B)=49) और (n(A-B)=21) है, तो (n(\(A\cup B\)')) के लिए सही मान चुनें।

If (n(U)=110), (n(A)=58), (n(B)=49) and (n(A-B)=21), choose the correct value of (n(\(A\cup B\)')).

Explanation opens after your attempt
Correct Answer

A. (40)

Step 1

Concept

\(A\cap B\) has (58-21=37) elements, so the union is (70) and the complement is (40). Fill inner regions first and then find the outside part.

Step 2

Why this answer is correct

The correct answer is A. (40). \(A\cap B\) has (58-21=37) elements, so the union is (70) and the complement is (40). Fill inner regions first and then find the outside part.

Step 3

Exam Tip

\(A\cap B\) में (58-21=37) तत्व हैं, इसलिए संघ (70) और पूरक (40) है। पहले आरेख के अंदर के क्षेत्र भरें फिर बाहर का भाग निकालें।

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तीन विषयों के सर्वे में (n(M)=60), (n(P)=54), (n(C)=50), (n\(M\cap P\)=25), (n\(P\cap C\)=22), (n\(C\cap M\)=20), (n\(M\cap P\cap C\)=10) है। केवल (M) पढ़ने वाले कितने हैं?

In a survey of three subjects (n(M)=60), (n(P)=54), (n(C)=50), (n\(M\cap P\)=25), (n\(P\cap C\)=22), (n\(C\cap M\)=20), (n\(M\cap P\cap C\)=10). How many study only (M)?

Explanation opens after your attempt
Correct Answer

A. (25)

Step 1

Concept

Only (M=60-25-20+10=25). In three sets, the centre is subtracted twice and must be added back.

Step 2

Why this answer is correct

The correct answer is A. (25). Only (M=60-25-20+10=25). In three sets, the centre is subtracted twice and must be added back.

Step 3

Exam Tip

केवल (M=60-25-20+10=25) है। तीन समुच्चयों में केंद्र को घटाने के बाद वापस जोड़ना पड़ता है।

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यदि केवल (A) में (12), केवल (B) में (15), केवल (C) में (18), केवल \(A\cap B\) में (9), केवल \(B\cap C\) में (7), केवल \(C\cap A\) में (6), और \(A\cap B\cap C\) में (4) हैं, तो (n(A\cap\(B\cup C\))) कितना है?

If only (A) has (12), only (B) has (15), only (C) has (18), only \(A\cap B\) has (9), only \(B\cap C\) has (7), only \(C\cap A\) has (6), and \(A\cap B\cap C\) has (4), then what is (n(A\cap\(B\cup C\)))?

Explanation opens after your attempt
Correct Answer

A. (19)

Step 1

Concept

(A\cap\(B\cup C\)) includes \(A\cap B\), \(A\cap C\), and the centre, so (9+6+4=19). The only (A) region is not included.

Step 2

Why this answer is correct

The correct answer is A. (19). (A\cap\(B\cup C\)) includes \(A\cap B\), \(A\cap C\), and the centre, so (9+6+4=19). The only (A) region is not included.

Step 3

Exam Tip

(A\cap\(B\cup C\)) में \(A\cap B\), \(A\cap C\) और केंद्र आते हैं, इसलिए (9+6+4=19) है। केवल (A) इसमें शामिल नहीं होगा।

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कौन सा वेन आरेखीय संबंध (A-\(B\cup C\)) को दर्शाता है?

Which Venn diagram region represents (A-\(B\cup C\))?

Explanation opens after your attempt
Correct Answer

A. केवल (A) का भागOnly the part of (A)

Step 1

Concept

(A-\(B\cup C\)) means being in (A) but outside both (B) and (C). In the Venn diagram, it is the only (A) region.

Step 2

Why this answer is correct

The correct answer is A. केवल (A) का भाग / Only the part of (A). (A-\(B\cup C\)) means being in (A) but outside both (B) and (C). In the Venn diagram, it is the only (A) region.

Step 3

Exam Tip

(A-\(B\cup C\)) का अर्थ (A) में रहकर (B) और (C) से बाहर होना है। वेन आरेख में यह केवल (A) वाला क्षेत्र है।

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यदि (A) और (B) अतिव्यापी समुच्चय हैं, तो \(A\cup B\) के वेन आरेख में कौन सा भाग छायांकित होगा?

If (A) and (B) are overlapping sets, which region is shaded for \(A\cup B\) in a Venn diagram?

Explanation opens after your attempt
Correct Answer

A. (A) और (B) दोनों वृत्तों का पूरा अंदरूनी भागEntire inside of both (A) and (B) circles

Step 1

Concept

\(A\cup B\) means (A) or (B) or both. Therefore, all inside regions of both circles are shaded.

Step 2

Why this answer is correct

The correct answer is A. (A) और (B) दोनों वृत्तों का पूरा अंदरूनी भाग / Entire inside of both (A) and (B) circles. \(A\cup B\) means (A) or (B) or both. Therefore, all inside regions of both circles are shaded.

Step 3

Exam Tip

\(A\cup B\) का अर्थ (A) या (B) या दोनों है। इसलिए दोनों वृत्तों के सभी अंदरूनी क्षेत्र छायांकित होंगे।

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यदि (n\(A\cap B\)=n(A)) और (n(A)>0) है, तो वेन आरेख में (A) और (B) का संबंध क्या होगा?

If (n\(A\cap B\)=n(A)) and (n(A)>0), what is the relation between (A) and (B) in a Venn diagram?

Explanation opens after your attempt
Correct Answer

A. \(A\subseteq B\)

Step 1

Concept

If all of (A) is common with (B), then (A) lies completely inside (B). Hence \(A\subseteq B\) is correct.

Step 2

Why this answer is correct

The correct answer is A. \(A\subseteq B\). If all of (A) is common with (B), then (A) lies completely inside (B). Hence \(A\subseteq B\) is correct.

Step 3

Exam Tip

यदि (A) का पूरा भाग (B) से साझा है, तो (A) पूरी तरह (B) के अंदर है। इसलिए \(A\subseteq B\) सही है।

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(n(U)=95), (n(A')=47), (n(B')=52) और (n\(A\cap B\)=18) है। (n\(A\cup B\)) कितना है?

(n(U)=95), (n(A')=47), (n(B')=52) and (n\(A\cap B\)=18). What is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (66)

Step 1

Concept

(n(A)=95-47=48) and (n(B)=95-52=43), so the union is (48+43-18=73), not (66). Recheck the formula before matching options.

Step 2

Why this answer is correct

The correct answer is A. (66). (n(A)=95-47=48) and (n(B)=95-52=43), so the union is (48+43-18=73), not (66). Recheck the formula before matching options.

Step 3

Exam Tip

(n(A)=95-47=48) और (n(B)=95-52=43), इसलिए संघ (48+43-18=73) नहीं बल्कि (73) है। विकल्पों से मिलान करते समय सूत्र दोबारा देखें।

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यदि (n(U)=95), (n(A')=47), (n(B')=52) और (n\(A\cap B\)=18) है, तो (n\(A\cup B\)) का सही मान चुनें।

If (n(U)=95), (n(A')=47), (n(B')=52) and (n\(A\cap B\)=18), choose the correct value of (n\(A\cup B\)).

Explanation opens after your attempt
Correct Answer

A. (73)

Step 1

Concept

(n(A)=48), (n(B)=43), so (n\(A\cup B\)=48+43-18=73). First obtain the original set sizes from complements.

Step 2

Why this answer is correct

The correct answer is A. (73). (n(A)=48), (n(B)=43), so (n\(A\cup B\)=48+43-18=73). First obtain the original set sizes from complements.

Step 3

Exam Tip

(n(A)=48), (n(B)=43), इसलिए (n\(A\cup B\)=48+43-18=73) है। पूरक से मूल समुच्चय निकालना पहला कदम रखें।

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यदि (n\(A\cap B'\)=24), (n\(A'\cap B\)=31) और (n\(A\cap B\)=16) है, तो (n\(A\cup B\)) कितना है?

If (n\(A\cap B'\)=24), (n\(A'\cap B\)=31) and (n\(A\cap B\)=16), then what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (71)

Step 1

Concept

The three disjoint parts of the union are (24), (31), and (16), whose sum is (71). In a Venn diagram, separate regions can be added directly.

Step 2

Why this answer is correct

The correct answer is A. (71). The three disjoint parts of the union are (24), (31), and (16), whose sum is (71). In a Venn diagram, separate regions can be added directly.

Step 3

Exam Tip

संघ के तीन अलग भाग (24), (31) और (16) हैं, जिनका योग (71) है। वेन आरेख में अलग-अलग क्षेत्रों को सीधे जोड़ सकते हैं।

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किसी सर्वे में (90) लोगों में (52) चाय, (47) कॉफी और (25) दोनों पसंद करते हैं। न चाय न कॉफी पसंद करने वाले कितने हैं?

In a survey of (90) people, (52) like tea, (47) like coffee and (25) like both. How many like neither tea nor coffee?

Explanation opens after your attempt
Correct Answer

A. (16)

Step 1

Concept

The union is (52+47-25=74), so outside is (90-74=16). In such questions, neither means the complement.

Step 2

Why this answer is correct

The correct answer is A. (16). The union is (52+47-25=74), so outside is (90-74=16). In such questions, neither means the complement.

Step 3

Exam Tip

संघ (52+47-25=74) है, इसलिए बाहर (90-74=16) है। ऐसे प्रश्नों में किसी भी नहीं का अर्थ पूरक होता है।

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(100) विद्यार्थियों में (40) केवल (A), (28) केवल (B) और (12) दोनों में हैं। कम से कम एक में आने वाले कितने हैं?

Among (100) students, (40) are only in (A), (28) are only in (B), and (12) are in both. How many are in at least one?

Explanation opens after your attempt
Correct Answer

A. (80)

Step 1

Concept

At least one means the union, so (40+28+12=80). Add the only regions and the both region separately.

Step 2

Why this answer is correct

The correct answer is A. (80). At least one means the union, so (40+28+12=80). Add the only regions and the both region separately.

Step 3

Exam Tip

कम से कम एक का अर्थ संघ है, इसलिए (40+28+12=80) है। केवल और दोनों वाले भागों को अलग-अलग जोड़ें।

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यदि \(A\cap B\cap C=\varnothing\), (n(A)=30), (n(B)=34), (n(C)=36), (n\(A\cap B\)=8), (n\(B\cap C\)=10), (n\(C\cap A\)=6) है, तो (n\(A\cup B\cup C\)) कितना है?

If \(A\cap B\cap C=\varnothing\), (n(A)=30), (n(B)=34), (n(C)=36), (n\(A\cap B\)=8), (n\(B\cap C\)=10), (n\(C\cap A\)=6), then what is (n\(A\cup B\cup C\))?

Explanation opens after your attempt
Correct Answer

A. (76)

Step 1

Concept

The union of three sets is (30+34+36-8-10-6+0=76). If the centre is empty, keep the final addition as (0).

Step 2

Why this answer is correct

The correct answer is A. (76). The union of three sets is (30+34+36-8-10-6+0=76). If the centre is empty, keep the final addition as (0).

Step 3

Exam Tip

तीन समुच्चयों का संघ (30+34+36-8-10-6+0=76) है। यदि केंद्र खाली हो तो अंतिम जोड़ (0) रखें।

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यदि (n\(A\cup B\cup C\)=118), (n(A)=45), (n(B)=50), (n(C)=55), (n\(A\cap B\)=18), (n\(B\cap C\)=20), (n\(C\cap A\)=16) है, तो (n\(A\cap B\cap C\)) कितना है?

If (n\(A\cup B\cup C\)=118), (n(A)=45), (n(B)=50), (n(C)=55), (n\(A\cap B\)=18), (n\(B\cap C\)=20), (n\(C\cap A\)=16), then what is (n\(A\cap B\cap C\))?

Explanation opens after your attempt
Correct Answer

A. (22)

Step 1

Concept

Using the formula (118=45+50+55-18-20-16+x), so (x=22). Let the unknown centre be (x) to form an equation easily.

Step 2

Why this answer is correct

The correct answer is A. (22). Using the formula (118=45+50+55-18-20-16+x), so (x=22). Let the unknown centre be (x) to form an equation easily.

Step 3

Exam Tip

सूत्र में (118=45+50+55-18-20-16+x), इसलिए (x=22) है। अज्ञात केंद्र को (x) मानकर समीकरण बनाना आसान है।

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यदि (n(A)=3x+2), (n(B)=2x+5), (n\(A\cap B\)=x+1) और (n\(A\cup B\)=30) है, तो (x) का मान कितना है?

If (n(A)=3x+2), (n(B)=2x+5), (n\(A\cap B\)=x+1) and (n\(A\cup B\)=30), then what is (x)?

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

(30=(3x+2)+(2x+5)-(x+1)=4x+6), so (x=6). In algebraic Venn questions, first apply the union formula.

Step 2

Why this answer is correct

The correct answer is A. (6). (30=(3x+2)+(2x+5)-(x+1)=4x+6), so (x=6). In algebraic Venn questions, first apply the union formula.

Step 3

Exam Tip

(30=(3x+2)+(2x+5)-(x+1)=4x+6), इसलिए (x=6) है। बीजगणितीय वेन प्रश्न में पहले संघ का सूत्र लगाएँ।

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यदि (n(A-B)=2x+3), (n(B-A)=x+7), (n\(A\cap B\)=x-1) और (n\(A\cup B\)=45) है, तो (x) कितना है?

If (n(A-B)=2x+3), (n(B-A)=x+7), (n\(A\cap B\)=x-1) and (n\(A\cup B\)=45), then what is (x)?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

The union is (2x+3+x+7+x-1=4x+9=45), so (x=9). The sum of disjoint regions directly gives the union.

Step 2

Why this answer is correct

The correct answer is A. (9). The union is (2x+3+x+7+x-1=4x+9=45), so (x=9). The sum of disjoint regions directly gives the union.

Step 3

Exam Tip

संघ (2x+3+x+7+x-1=4x+9=45), इसलिए (x=9) है। अलग क्षेत्रों का योग सीधे संघ देता है।

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\(यदि (A={x:x\in \mathbb{N},x\le 12}), (B={x:x\) is even\(,x\le 12}) और (C={x:x\) is a multiple of \(3,x\le 12}) है, तो (n(B\cap C)) कितना है\)?

\(If (A={x:x\in \mathbb{N},x\le 12}), (B={x:x\) is even\(,x\le 12}) and (C={x:x\) is a multiple of \(3,x\le 12}), then what is (n(B\cap C))\)?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

\(B\cap C\) contains (6) and (12), so the count is (2). For intersection, both conditions must be satisfied together.

Step 2

Why this answer is correct

The correct answer is A. (2). \(B\cap C\) contains (6) and (12), so the count is (2). For intersection, both conditions must be satisfied together.

Step 3

Exam Tip

\(B\cap C\) में (6) और (12) हैं, इसलिए संख्या (2) है। प्रतिच्छेद के लिए दोनों शर्तें साथ में पूरी होनी चाहिए।

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यदि \(U={1,2,\ldots,20}\), (A) अभाज्य संख्याओं का समुच्चय और (B) विषम संख्याओं का समुच्चय है, तो (A-B) क्या होगा?

If \(U={1,2,\ldots,20}\), (A) is the set of prime numbers and (B) is the set of odd numbers, then what is (A-B)?

Explanation opens after your attempt
Correct Answer

A. ({2})

Step 1

Concept

(A-B) contains primes that are not odd, so only (2) remains. In set difference, remove the elements of the second set.

Step 2

Why this answer is correct

The correct answer is A. ({2}). (A-B) contains primes that are not odd, so only (2) remains. In set difference, remove the elements of the second set.

Step 3

Exam Tip

(A-B) में वे अभाज्य होंगे जो विषम नहीं हैं, इसलिए केवल (2) बचेगा। समुच्चय अंतर में दूसरे समुच्चय के तत्व हटा दें।

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यदि \(U={1,2,\ldots,30}\), (A) (2) के गुणजों का और (B) (5) के गुणजों का समुच्चय है, तो (n\(A\cup B\)) कितना है?

If \(U={1,2,\ldots,30}\), (A) is the set of multiples of (2) and (B) is the set of multiples of (5), then what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

Multiples of (2) are (15), multiples of (5) are (6), and multiples of (10) are (3), so the union is (15+6-3=18). Subtract common multiples once.

Step 2

Why this answer is correct

The correct answer is A. (18). Multiples of (2) are (15), multiples of (5) are (6), and multiples of (10) are (3), so the union is (15+6-3=18). Subtract common multiples once.

Step 3

Exam Tip

(2) के गुणज (15), (5) के गुणज (6), और (10) के गुणज (3) हैं, इसलिए संघ (15+6-3=18) है। साझा गुणजों को एक बार घटाएँ।

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यदि \(U={1,2,\ldots,50}\), (A) (4) के गुणजों का और (B) (6) के गुणजों का समुच्चय है, तो (n\(A\cap B\)) कितना है?

If \(U={1,2,\ldots,50}\), (A) is the set of multiples of (4) and (B) is the set of multiples of (6), then what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

Common multiples are multiples of (\operatorname{lcm}(4,6)=12), namely (12,24,36,48). Hence the count is (4).

Step 2

Why this answer is correct

The correct answer is A. (4). Common multiples are multiples of (\operatorname{lcm}(4,6)=12), namely (12,24,36,48). Hence the count is (4).

Step 3

Exam Tip

साझा गुणज (\operatorname{lcm}(4,6)=12) के गुणज होंगे, जो (12,24,36,48) हैं। इसलिए संख्या (4) है।

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एक वेन आरेख में (A) और (B) के बाहर (14), केवल (A) में (22), केवल (B) में (18), और दोनों में (11) हैं। (n(U)) कितना है?

In a Venn diagram, outside (A) and (B) there are (14), only (A) has (22), only (B) has (18), and both have (11). What is (n(U))?

Explanation opens after your attempt
Correct Answer

A. (65)

Step 1

Concept

The universal set is the sum of all regions (14+22+18+11=65). The outside region is also included in (U).

Step 2

Why this answer is correct

The correct answer is A. (65). The universal set is the sum of all regions (14+22+18+11=65). The outside region is also included in (U).

Step 3

Exam Tip

सार्वत्रिक समुच्चय सभी क्षेत्रों का योग (14+22+18+11=65) है। बाहर का भाग भी (U) में शामिल होता है।

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यदि (n\(A\cup B\)=84) और (n\(A\cap B\)=27) है, तो (n(A-B)+n(B-A)) कितना है?

If (n\(A\cup B\)=84) and (n\(A\cap B\)=27), then what is (n(A-B)+n(B-A))?

Explanation opens after your attempt
Correct Answer

A. (57)

Step 1

Concept

The sum of the two only regions is union minus intersection (84-27=57). This is also the size of the symmetric difference.

Step 2

Why this answer is correct

The correct answer is A. (57). The sum of the two only regions is union minus intersection (84-27=57). This is also the size of the symmetric difference.

Step 3

Exam Tip

दोनों केवल भागों का योग संघ से प्रतिच्छेद घटाकर (84-27=57) है। यह सममित अंतर की संख्या भी है।

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किसी सर्वे में (160) लोगों में (92) मोबाइल, (78) लैपटॉप और (51) दोनों रखते हैं। ठीक एक उपकरण रखने वाले कितने हैं?

In a survey of (160) people, (92) have a mobile, (78) have a laptop and (51) have both. How many have exactly one device?

Explanation opens after your attempt
Correct Answer

A. (68)

Step 1

Concept

Exactly one is ((92-51)+(78-51)=68). People having both are not counted in exactly one.

Step 2

Why this answer is correct

The correct answer is A. (68). Exactly one is ((92-51)+(78-51)=68). People having both are not counted in exactly one.

Step 3

Exam Tip

ठीक एक (=(92-51)+(78-51)=68) है। दोनों रखने वालों को ठीक एक में नहीं गिना जाता।

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यदि (70) में से (45) विद्यार्थी हिंदी, (40) अंग्रेजी और (30) दोनों पढ़ते हैं, तो कम से कम एक भाषा पढ़ने वाले कितने हैं?

If out of (70) students, (45) study Hindi, (40) study English and (30) study both, then how many study at least one language?

Explanation opens after your attempt
Correct Answer

A. (55)

Step 1

Concept

At least one is (45+40-30=55). The intersection is subtracted to avoid double counting.

Step 2

Why this answer is correct

The correct answer is A. (55). At least one is (45+40-30=55). The intersection is subtracted to avoid double counting.

Step 3

Exam Tip

कम से कम एक (45+40-30=55) है। प्रतिच्छेद को दो बार गिनने से बचने के लिए घटाते हैं।

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यदि (n\(A\cup B\)=n(U)) है, तो वेन आरेख में कौन सा क्षेत्र खाली होगा?

If (n\(A\cup B\)=n(U)), which region is empty in the Venn diagram?

Explanation opens after your attempt
Correct Answer

A. (\(A\cup B\)')

Step 1

Concept

When the union equals the whole (U), no element remains outside the union. Therefore, (\(A\cup B\)') is empty.

Step 2

Why this answer is correct

The correct answer is A. (\(A\cup B\)'). When the union equals the whole (U), no element remains outside the union. Therefore, (\(A\cup B\)') is empty.

Step 3

Exam Tip

जब संघ पूरे (U) के बराबर हो, तो संघ के बाहर कोई तत्व नहीं रहता। इसलिए (\(A\cup B\)') खाली होगा।

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यदि \(A\cap B=\varnothing\) और \(B\cap C=\varnothing\), तो क्या \(A\cap C=\varnothing\) अवश्य होगा?

If \(A\cap B=\varnothing\) and \(B\cap C=\varnothing\), must \(A\cap C=\varnothing\)?

Explanation opens after your attempt
Correct Answer

A. नहीं, (A) और (C) अतिव्यापी हो सकते हैंNo, (A) and (C) may overlap

Step 1

Concept

(B) can be separate from both, while (A) and (C) may still overlap. In Venn diagrams, understand independent relations separately.

Step 2

Why this answer is correct

The correct answer is A. नहीं, (A) और (C) अतिव्यापी हो सकते हैं / No, (A) and (C) may overlap. (B) can be separate from both, while (A) and (C) may still overlap. In Venn diagrams, understand independent relations separately.

Step 3

Exam Tip

(B) दोनों से अलग हो सकता है, लेकिन (A) और (C) आपस में मिल सकते हैं। वेन आरेख में स्वतंत्र संबंधों को अलग-अलग समझें।

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यदि (A) और (B) असंबद्ध हैं, तो (\(A\cup B\)') किसके बराबर है?

If (A) and (B) are disjoint, then (\(A\cup B\)') is equal to what?

Explanation opens after your attempt
Correct Answer

A. \(A'\cap B'\)

Step 1

Concept

By De Morgan's law, (\(A\cup B\)'=A'\cap B'). This rule is true for both disjoint and general cases.

Step 2

Why this answer is correct

The correct answer is A. \(A'\cap B'\). By De Morgan's law, (\(A\cup B\)'=A'\cap B'). This rule is true for both disjoint and general cases.

Step 3

Exam Tip

डी मॉर्गन नियम के अनुसार (\(A\cup B\)'=A'\cap B') है। यह नियम असंबद्ध और सामान्य दोनों स्थितियों में सही है।

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यदि (n(U)=60), (n(A)=35), (n(B)=32) है, तो (n\(A\cap B\)) का न्यूनतम संभव मान कितना है?

If (n(U)=60), (n(A)=35), (n(B)=32), then what is the minimum possible value of (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (7)

Step 1

Concept

The minimum intersection is (35+32-60=7). If the sum exceeds (U), that much overlap is necessary.

Step 2

Why this answer is correct

The correct answer is A. (7). The minimum intersection is (35+32-60=7). If the sum exceeds (U), that much overlap is necessary.

Step 3

Exam Tip

न्यूनतम प्रतिच्छेद (35+32-60=7) होगा। यदि योग (U) से अधिक हो तो उतना अतिव्यापन अनिवार्य है।

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यदि (n(U)=100), (n(A)=64), (n(B)=58) है, तो (n\(A\cup B\)) का न्यूनतम संभव मान कितना है?

If (n(U)=100), (n(A)=64), (n(B)=58), then what is the minimum possible value of (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (64)

Step 1

Concept

The minimum union can be as small as the larger set, which is (64). This happens when \(B\subseteq A\) is possible.

Step 2

Why this answer is correct

The correct answer is A. (64). The minimum union can be as small as the larger set, which is (64). This happens when \(B\subseteq A\) is possible.

Step 3

Exam Tip

संघ का न्यूनतम मान बड़े समुच्चय जितना हो सकता है, यानी (64)। यह तब होगा जब \(B\subseteq A\) हो सकता है।

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यदि (n(A)=46), (n(B)=39) है, तो (n\(A\cap B\)) का अधिकतम संभव मान कितना है?

If (n(A)=46), (n(B)=39), then what is the maximum possible value of (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (39)

Step 1

Concept

The maximum intersection cannot exceed the smaller set, so it is (39). In maximum overlap, the smaller set can lie inside the larger set.

Step 2

Why this answer is correct

The correct answer is A. (39). The maximum intersection cannot exceed the smaller set, so it is (39). In maximum overlap, the smaller set can lie inside the larger set.

Step 3

Exam Tip

प्रतिच्छेद का अधिकतम मान छोटे समुच्चय से अधिक नहीं हो सकता, इसलिए (39) है। अधिकतम अतिव्यापन में छोटा समुच्चय बड़े में समा सकता है।

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यदि (n(A)=30), (n(B)=28) और (n\(A\cup B\)=52) है, तो (n(A-B)) कितना है?

If (n(A)=30), (n(B)=28) and (n\(A\cup B\)=52), then what is (n(A-B))?

Explanation opens after your attempt
Correct Answer

A. (24)

Step 1

Concept

First (n\(A\cap B\)=30+28-52=6), then (A-B=30-6=24). Identify the common part before finding difference.

Step 2

Why this answer is correct

The correct answer is A. (24). First (n\(A\cap B\)=30+28-52=6), then (A-B=30-6=24). Identify the common part before finding difference.

Step 3

Exam Tip

पहले (n\(A\cap B\)=30+28-52=6), फिर (A-B=30-6=24) है। अंतर निकालने से पहले साझा भाग पहचानें।

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यदि (n(A-B)=18), (n(B-C)=25), (n(C-A)=20) दिए हों, तो क्या केवल इनसे (n\(A\cup B\cup C\)) निश्चित किया जा सकता है?

If (n(A-B)=18), (n(B-C)=25), (n(C-A)=20) are given, can (n\(A\cup B\cup C\)) be determined uniquely from only these?

Explanation opens after your attempt
Correct Answer

A. नहीं, साझा क्षेत्रों की जानकारी चाहिएNo, information about common regions is needed

Step 1

Concept

These differences do not give all Venn regions. To find the union, complete information about common and only regions is needed.

Step 2

Why this answer is correct

The correct answer is A. नहीं, साझा क्षेत्रों की जानकारी चाहिए / No, information about common regions is needed. These differences do not give all Venn regions. To find the union, complete information about common and only regions is needed.

Step 3

Exam Tip

इन अंतरों से सभी वेन क्षेत्रों की जानकारी नहीं मिलती। संघ के लिए साझा और केवल क्षेत्रों का पूरा विवरण चाहिए।

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एक वेन आरेख में (n\(A\cap B\)=14) और (n\(A\cap B\cap C\)=6) है। केवल \(A\cap B\) में कितने तत्व हैं?

In a Venn diagram, (n\(A\cap B\)=14) and (n\(A\cap B\cap C\)=6). How many elements are only in \(A\cap B\)?

Explanation opens after your attempt
Correct Answer

A. (8)

Step 1

Concept

Only \(A\cap B\) has (14-6=8) elements. A two-set intersection includes the centre also.

Step 2

Why this answer is correct

The correct answer is A. (8). Only \(A\cap B\) has (14-6=8) elements. A two-set intersection includes the centre also.

Step 3

Exam Tip

केवल \(A\cap B\) में (14-6=8) तत्व होंगे। दो-समुच्चय प्रतिच्छेद में केंद्र भी शामिल होता है।

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यदि (n\(A\cup B\cup C\)=140), ठीक एक समुच्चय में (65) और ठीक दो समुच्चयों में (51) तत्व हैं, तो (n\(A\cap B\cap C\)) कितना है?

If (n\(A\cup B\cup C\)=140), exactly one set has (65) elements and exactly two sets have (51) elements, then what is (n\(A\cap B\cap C\))?

Explanation opens after your attempt
Correct Answer

A. (24)

Step 1

Concept

Union equals exactly one plus exactly two plus all three, so all three is (140-65-51=24). In region-sum questions, keep the parts separate.

Step 2

Why this answer is correct

The correct answer is A. (24). Union equals exactly one plus exactly two plus all three, so all three is (140-65-51=24). In region-sum questions, keep the parts separate.

Step 3

Exam Tip

संघ (=) ठीक एक (+) ठीक दो (+) तीनों, इसलिए तीनों (140-65-51=24) है। क्षेत्र-आधारित योग प्रश्नों में हिस्सों को अलग रखें।

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Class 11 Mathematics Quiz FAQs

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