Class 11 Mathematics - Relations And Functions - Cartesian product of sets Hard Quiz

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एक सर्वेक्षण में (n(U)=120), (n(A)=72), (n(B)=65) और (n\(A\cap B\)=38) है। केवल (A) में कितने विद्यार्थी हैं?

In a survey, (n(U)=120), (n(A)=72), (n(B)=65), and (n\(A\cap B\)=38). How many students are only in (A)?

Explanation opens after your attempt
Correct Answer

A. (34)

Step 1

Concept

Only (A) is (n(A)-n\(A\cap B\)=72-38=34). In exams, subtract the common part first.

Step 2

Why this answer is correct

The correct answer is A. (34). Only (A) is (n(A)-n\(A\cap B\)=72-38=34). In exams, subtract the common part first.

Step 3

Exam Tip

केवल (A) के लिए (n(A)-n\(A\cap B\)=72-38=34)। परीक्षा में पहले साझा भाग घटाएं।

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यदि (n\(A\cup B\)=96), (n(A)=58) और (n(B)=49) है, तो (n\(A\cap B\)) ज्ञात कीजिए।

If (n\(A\cup B\)=96), (n(A)=58), and (n(B)=49), find (n\(A\cap B\)).

Explanation opens after your attempt
Correct Answer

A. (11)

Step 1

Concept

Using (n\(A\cup B\)=n(A)+n(B)-n\(A\cap B\)), the common part is (58+49-96=11). Always remove double counting in a union.

Step 2

Why this answer is correct

The correct answer is A. (11). Using (n\(A\cup B\)=n(A)+n(B)-n\(A\cap B\)), the common part is (58+49-96=11). Always remove double counting in a union.

Step 3

Exam Tip

सूत्र (n\(A\cup B\)=n(A)+n(B)-n\(A\cap B\)) से साझा भाग (58+49-96=11) है। हमेशा संघ में दोहरी गिनती घटती है।

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किसी कक्षा में (n(U)=90), (n(A)=52), (n(B)=47) और (n\(A\cap B\)=24) है। न तो (A) और न ही (B) में कितने विद्यार्थी हैं?

In a class, (n(U)=90), (n(A)=52), (n(B)=47), and (n\(A\cap B\)=24). How many students are in neither (A) nor (B)?

Explanation opens after your attempt
Correct Answer

A. (15)

Step 1

Concept

First (n\(A\cup B\)=52+47-24=75), so outside is (90-75=15). In a Venn diagram, find the outside region at the end.

Step 2

Why this answer is correct

The correct answer is A. (15). First (n\(A\cup B\)=52+47-24=75), so outside is (90-75=15). In a Venn diagram, find the outside region at the end.

Step 3

Exam Tip

पहले (n\(A\cup B\)=52+47-24=75), इसलिए बाहर (90-75=15) है। वेन आरेख में बाहर का क्षेत्र अंत में निकालें।

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यदि (n(U)=150), (n\(A\cup B\)=118) है, तो (\(A\cup B\)') में तत्वों की संख्या क्या होगी?

If (n(U)=150) and (n\(A\cup B\)=118), what is the number of elements in (\(A\cup B\)')?

Explanation opens after your attempt
Correct Answer

A. (32)

Step 1

Concept

For complement, (n(\(A\cup B\)')=n(U)-n\(A\cup B\)=150-118=32). A complement is always taken with respect to the universal set.

Step 2

Why this answer is correct

The correct answer is A. (32). For complement, (n(\(A\cup B\)')=n(U)-n\(A\cup B\)=150-118=32). A complement is always taken with respect to the universal set.

Step 3

Exam Tip

पूरक के लिए (n(\(A\cup B\)')=n(U)-n\(A\cup B\)=150-118=32)। पूरक हमेशा सार्वत्रिक समुच्चय से संबंधित होता है।

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तीन समुच्चयों के लिए (n(A)=40), (n(B)=38), (n(C)=35), (n\(A\cap B\)=14), (n\(B\cap C\)=12), (n\(C\cap A\)=10), (n\(A\cap B\cap C\)=5) है। (n\(A\cup B\cup C\)) कितना है?

For three sets, (n(A)=40), (n(B)=38), (n(C)=35), (n\(A\cap B\)=14), (n\(B\cap C\)=12), (n\(C\cap A\)=10), and (n\(A\cap B\cap C\)=5). What is (n\(A\cup B\cup C\))?

Explanation opens after your attempt
Correct Answer

A. (82)

Step 1

Concept

The three-set formula gives (40+38+35-14-12-10+5=82). The common part of all three must be added back at the end.

Step 2

Why this answer is correct

The correct answer is A. (82). The three-set formula gives (40+38+35-14-12-10+5=82). The common part of all three must be added back at the end.

Step 3

Exam Tip

तीन समुच्चयों का सूत्र (40+38+35-14-12-10+5=82) देता है। तीनों के साझा भाग को अंत में फिर जोड़ना जरूरी है।

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यदि (n\(A\cup B\cup C\)=100), (n(A)=50), (n(B)=45), (n(C)=40), (n\(A\cap B\)=18), (n\(B\cap C\)=15), (n\(C\cap A\)=12) है, तो (n\(A\cap B\cap C\)) क्या है?

If (n\(A\cup B\cup C\)=100), (n(A)=50), (n(B)=45), (n(C)=40), (n\(A\cap B\)=18), (n\(B\cap C\)=15), and (n\(C\cap A\)=12), what is (n\(A\cap B\cap C\))?

Explanation opens after your attempt
Correct Answer

A. (10)

Step 1

Concept

In the formula, (100=50+45+40-18-15-12+x), so (x=10). Take the unknown triple intersection as (x) and solve.

Step 2

Why this answer is correct

The correct answer is A. (10). In the formula, (100=50+45+40-18-15-12+x), so (x=10). Take the unknown triple intersection as (x) and solve.

Step 3

Exam Tip

सूत्र में (100=50+45+40-18-15-12+x), इसलिए (x=10)। अज्ञात त्रिक छेदन को (x) मानकर हल करें।

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एक वेन आरेख में (n\(A\cap B\cap C\)=7), केवल \(A\cap B\) में (9), केवल \(B\cap C\) में (6), केवल \(C\cap A\) में (5) और केवल (A) में (18) है। (n(A)) कितना है?

In a Venn diagram, (n\(A\cap B\cap C\)=7), only \(A\cap B\) is (9), only \(B\cap C\) is (6), only \(C\cap A\) is (5), and only (A) is (18). What is (n(A))?

Explanation opens after your attempt
Correct Answer

A. (39)

Step 1

Concept

Set (A) contains only (A), only \(A\cap B\), only \(C\cap A\), and the triple part, so (18+9+5+7=39). While adding regions, choose only parts inside (A).

Step 2

Why this answer is correct

The correct answer is A. (39). Set (A) contains only (A), only \(A\cap B\), only \(C\cap A\), and the triple part, so (18+9+5+7=39). While adding regions, choose only parts inside (A).

Step 3

Exam Tip

(A) में केवल (A), केवल \(A\cap B\), केवल \(C\cap A\) और तीनों साझा आते हैं, इसलिए (18+9+5+7=39)। क्षेत्र जोड़ते समय केवल (A) के अंदर वाले भाग चुनें।

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एक सर्वेक्षण में (n(U)=200), (n\(A\cup B\cup C\)=164) है। तीनों में से किसी में भी नहीं होने वालों की संख्या क्या है?

In a survey, (n(U)=200) and (n\(A\cup B\cup C\)=164). What is the number of people in none of the three sets?

Explanation opens after your attempt
Correct Answer

A. (36)

Step 1

Concept

None of them equals (n(U)-n\(A\cup B\cup C\)=200-164=36). The outside region is found by subtracting the union from the universal set.

Step 2

Why this answer is correct

The correct answer is A. (36). None of them equals (n(U)-n\(A\cup B\cup C\)=200-164=36). The outside region is found by subtracting the union from the universal set.

Step 3

Exam Tip

किसी में भी नहीं (=n(U)-n\(A\cup B\cup C\)=200-164=36)। बाहरी क्षेत्र सार्वत्रिक समुच्चय से संघ घटाने पर मिलता है।

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यदि केवल (A), केवल (B), केवल (C), ठीक दो समुच्चयों में और तीनों समुच्चयों में क्रमशः (16), (19), (14), (27), (8) तत्व हैं, तो कम से कम एक समुच्चय में कुल कितने तत्व हैं?

If only (A), only (B), only (C), exactly two sets, and all three sets contain (16), (19), (14), (27), and (8) elements respectively, how many elements are in at least one set?

Explanation opens after your attempt
Correct Answer

A. (84)

Step 1

Concept

At least one means the union, so (16+19+14+27+8=84). In a Venn diagram, add all inside regions.

Step 2

Why this answer is correct

The correct answer is A. (84). At least one means the union, so (16+19+14+27+8=84). In a Venn diagram, add all inside regions.

Step 3

Exam Tip

कम से कम एक का अर्थ संघ है, इसलिए (16+19+14+27+8=84)। वेन आरेख में सभी अंदरूनी क्षेत्रों को जोड़ें।

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यदि (n(A)=60), (n(B)=55), (n\(A\cap B\)=25) है, तो ठीक एक समुच्चय में आने वाले तत्वों की संख्या क्या है?

If (n(A)=60), (n(B)=55), and (n\(A\cap B\)=25), what is the number of elements belonging to exactly one set?

Explanation opens after your attempt
Correct Answer

A. (65)

Step 1

Concept

Exactly one is ((60-25)+(55-25)=65). Subtract the common elements separately from both sets.

Step 2

Why this answer is correct

The correct answer is A. (65). Exactly one is ((60-25)+(55-25)=65). Subtract the common elements separately from both sets.

Step 3

Exam Tip

ठीक एक (=(60-25)+(55-25)=65)। दोनों में आने वालों को दोनों समुच्चयों से अलग-अलग घटाएं।

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किसी परीक्षा में (80) विद्यार्थियों में से (46) ने गणित, (39) ने भौतिकी और (22) ने दोनों चुने। केवल भौतिकी चुनने वालों की संख्या क्या है?

In an exam group of (80) students, (46) chose Mathematics, (39) chose Physics, and (22) chose both. How many chose only Physics?

Explanation opens after your attempt
Correct Answer

A. (17)

Step 1

Concept

Only Physics is (39-22=17). For an only-region, subtract the common region from the set total.

Step 2

Why this answer is correct

The correct answer is A. (17). Only Physics is (39-22=17). For an only-region, subtract the common region from the set total.

Step 3

Exam Tip

केवल भौतिकी (=39-22=17)। केवल वाले क्षेत्र के लिए कुल से साझा क्षेत्र घटाएं।

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यदि \(A\subseteq B\), (n(A)=28) और (n(B)=64) है, तो वेन आरेख में (B-A) क्षेत्र में कितने तत्व होंगे?

If \(A\subseteq B\), (n(A)=28), and (n(B)=64), how many elements will be in the (B-A) region of the Venn diagram?

Explanation opens after your attempt
Correct Answer

A. (36)

Step 1

Concept

When \(A\subseteq B\), (B-A) has (64-28=36) elements. The subset circle lies completely inside the larger set.

Step 2

Why this answer is correct

The correct answer is A. (36). When \(A\subseteq B\), (B-A) has (64-28=36) elements. The subset circle lies completely inside the larger set.

Step 3

Exam Tip

जब \(A\subseteq B\), तब (B-A) में (64-28=36) तत्व होते हैं। उपसमुच्चय का पूरा वृत्त बड़े समुच्चय के अंदर होता है।

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यदि \(A\cap B=\varnothing\), (n(A)=31) और (n(B)=44) है, तो (n\(A\cup B\)) कितना होगा?

If \(A\cap B=\varnothing\), (n(A)=31), and (n(B)=44), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (75)

Step 1

Concept

For disjoint sets, the common part is (0), so (31+44=75). Disjoint circles do not overlap in a Venn diagram.

Step 2

Why this answer is correct

The correct answer is A. (75). For disjoint sets, the common part is (0), so (31+44=75). Disjoint circles do not overlap in a Venn diagram.

Step 3

Exam Tip

असंबद्ध समुच्चयों में साझा भाग (0) होता है, इसलिए (31+44=75)। असंबद्ध वृत्त वेन आरेख में नहीं कटते।

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यदि (n(A-B)=23), (n(B-A)=17) और (n\(A\cap B\)=12) है, तो (n\(A\cup B\)) क्या है?

If (n(A-B)=23), (n(B-A)=17), and (n\(A\cap B\)=12), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (52)

Step 1

Concept

The union is the sum of three separate regions, so (23+17+12=52). In a Venn diagram, add each separate region only once.

Step 2

Why this answer is correct

The correct answer is A. (52). The union is the sum of three separate regions, so (23+17+12=52). In a Venn diagram, add each separate region only once.

Step 3

Exam Tip

संघ तीन अलग क्षेत्रों का योग है, इसलिए (23+17+12=52)। वेन आरेख में अलग-अलग क्षेत्रों को एक बार ही जोड़ें।

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यदि (n(A-B)=20), (n\(A\cap B\)=15) और (n(B)=47) है, तो (n(B-A)) ज्ञात कीजिए।

If (n(A-B)=20), (n\(A\cap B\)=15), and (n(B)=47), find (n(B-A)).

Explanation opens after your attempt
Correct Answer

A. (32)

Step 1

Concept

Set (B) contains (B-A) and \(A\cap B\), so (B-A=47-15=32). Do not get confused by the given (A-B).

Step 2

Why this answer is correct

The correct answer is A. (32). Set (B) contains (B-A) and \(A\cap B\), so (B-A=47-15=32). Do not get confused by the given (A-B).

Step 3

Exam Tip

(B) में (B-A) और \(A\cap B\) आते हैं, इसलिए (B-A=47-15=32)। दिए गए (A-B) से भ्रमित न हों।

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वेन आरेख में (n(A-B)=18), (n(B-C)=26), (n(C-A)=21) लिखना हमेशा किस कारण से सावधानी मांगता है?

In a Venn diagram, why must expressions like (n(A-B)=18), (n(B-C)=26), and (n(C-A)=21) be handled carefully?

Explanation opens after your attempt
Correct Answer

A. क्योंकि (A-B) में \(A\cap C\) का कुछ भाग आ सकता हैBecause (A-B) may include a part of \(A\cap C\)

Step 1

Concept

In three sets, (A-B) means all parts of (A) not in (B), which can include only (A) and only \(A\cap C\). Always interpret the region before placing the number.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि (A-B) में \(A\cap C\) का कुछ भाग आ सकता है / Because (A-B) may include a part of \(A\cap C\). In three sets, (A-B) means all parts of (A) not in (B), which can include only (A) and only \(A\cap C\). Always interpret the region before placing the number.

Step 3

Exam Tip

तीन समुच्चयों में (A-B) का अर्थ (A) में वे सभी भाग हैं जो (B) में नहीं हैं, इसमें केवल (A) और केवल \(A\cap C\) आ सकते हैं। क्षेत्र का अर्थ पढ़कर ही संख्या रखें।

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यदि (n(U)=100), (n(A)=48), (n(B)=52) और (n\(A'\cap B'\)=18) है, तो (n\(A\cap B\)) क्या है?

If (n(U)=100), (n(A)=48), (n(B)=52), and (n\(A'\cap B'\)=18), what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

\(A'\cap B'\) means outside both, so (n\(A\cup B\)=100-18=82). Now (48+52-n\(A\cap B\)=82), hence (18).

Step 2

Why this answer is correct

The correct answer is A. (18). \(A'\cap B'\) means outside both, so (n\(A\cup B\)=100-18=82). Now (48+52-n\(A\cap B\)=82), hence (18).

Step 3

Exam Tip

\(A'\cap B'\) का अर्थ दोनों से बाहर है, इसलिए (n\(A\cup B\)=100-18=82)। अब (48+52-n\(A\cap B\)=82), अतः (18)।

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यदि (n(A')=35), (n(B')=42), (n(U)=80) और (n\(A\cap B\)=25) है, तो (n\(A'\cap B'\)) कितना है?

If (n(A')=35), (n(B')=42), (n(U)=80), and (n\(A\cap B\)=25), what is (n\(A'\cap B'\))?

Explanation opens after your attempt
Correct Answer

A. (22)

Step 1

Concept

(n(A)=45) and (n(B)=38), so (n\(A\cup B\)=45+38-25=58). The outside part is (80-58=22).

Step 2

Why this answer is correct

The correct answer is A. (22). (n(A)=45) and (n(B)=38), so (n\(A\cup B\)=45+38-25=58). The outside part is (80-58=22).

Step 3

Exam Tip

(n(A)=45) और (n(B)=38), इसलिए (n\(A\cup B\)=45+38-25=58)। बाहर का भाग (80-58=22) है।

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किसी वेन आरेख में (n\(A\cup B\)=70), (n(A-B)=24) और (n(B-A)=31) है। (n\(A\cap B\)) कितना है?

In a Venn diagram, (n\(A\cup B\)=70), (n(A-B)=24), and (n(B-A)=31). What is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (15)

Step 1

Concept

Union equals ((A-B)+(B-A)+\(A\cap B\)), so the common part is (70-24-31=15). A union has three separate regions in two sets.

Step 2

Why this answer is correct

The correct answer is A. (15). Union equals ((A-B)+(B-A)+\(A\cap B\)), so the common part is (70-24-31=15). A union has three separate regions in two sets.

Step 3

Exam Tip

संघ (=(A-B)+(B-A)+\(A\cap B\)), इसलिए साझा भाग (70-24-31=15) है। संघ में तीन अलग क्षेत्र होते हैं।

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यदि (n\(A\Delta B\)=54) और (n\(A\cap B\)=19) है, तो (n\(A\cup B\)) क्या होगा?

If (n\(A\Delta B\)=54) and (n\(A\cap B\)=19), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (73)

Step 1

Concept

The symmetric difference \(A\Delta B\) gives the exactly-one regions, so the union is (54+19=73). The common region must be added separately.

Step 2

Why this answer is correct

The correct answer is A. (73). The symmetric difference \(A\Delta B\) gives the exactly-one regions, so the union is (54+19=73). The common region must be added separately.

Step 3

Exam Tip

सममित अंतर \(A\Delta B\) ठीक एक समुच्चय के क्षेत्र देता है, इसलिए संघ (54+19=73) है। साझा क्षेत्र अलग से जोड़ना होता है।

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तीन समुच्चयों में ठीक दो समुच्चयों में आने वालों की संख्या निकालने का सही सूत्र कौन सा है?

Which formula correctly gives the number of elements belonging to exactly two of three sets?

Explanation opens after your attempt
Correct Answer

A. (n\(A\cap B\)+n\(B\cap C\)+n\(C\cap A\)-3n\(A\cap B\cap C\))

Step 1

Concept

Each pairwise intersection includes the triple intersection, counted three times, so (3n\(A\cap B\cap C\)) is subtracted. Exactly two does not include the triple part.

Step 2

Why this answer is correct

The correct answer is A. (n\(A\cap B\)+n\(B\cap C\)+n\(C\cap A\)-3n\(A\cap B\cap C\)). Each pairwise intersection includes the triple intersection, counted three times, so (3n\(A\cap B\cap C\)) is subtracted. Exactly two does not include the triple part.

Step 3

Exam Tip

हर युग्म छेदन में त्रिक छेदन शामिल होता है, जो तीन बार गिना जाता है, इसलिए (3n\(A\cap B\cap C\)) घटता है। ठीक दो में त्रिक भाग शामिल नहीं होता।

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यदि (n\(A\cap B\)=20), (n\(B\cap C\)=18), (n\(C\cap A\)=16) और (n\(A\cap B\cap C\)=6) है, तो ठीक दो समुच्चयों में कितने तत्व हैं?

If (n\(A\cap B\)=20), (n\(B\cap C\)=18), (n\(C\cap A\)=16), and (n\(A\cap B\cap C\)=6), how many elements are in exactly two sets?

Explanation opens after your attempt
Correct Answer

A. (36)

Step 1

Concept

Exactly two is \(20+18+16-3\cdot6=36\). The triple part is counted repeatedly in pairwise intersections.

Step 2

Why this answer is correct

The correct answer is A. (36). Exactly two is \(20+18+16-3\cdot6=36\). The triple part is counted repeatedly in pairwise intersections.

Step 3

Exam Tip

ठीक दो \(=20+18+16-3\cdot6=36\)। युग्म छेदनों में त्रिक भाग बार-बार गिना जाता है।

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यदि केवल (A) में (12), केवल (B) में (15), केवल (C) में (10), ठीक दो में (33), तीनों में (9) और बाहर (21) हैं, तो (n(U)) क्या है?

If only (A) has (12), only (B) has (15), only (C) has (10), exactly two has (33), all three has (9), and outside has (21), what is (n(U))?

Explanation opens after your attempt
Correct Answer

A. (100)

Step 1

Concept

The universal set contains all inside and outside regions, so (12+15+10+33+9+21=100). Do not skip any region.

Step 2

Why this answer is correct

The correct answer is A. (100). The universal set contains all inside and outside regions, so (12+15+10+33+9+21=100). Do not skip any region.

Step 3

Exam Tip

सार्वत्रिक समुच्चय में अंदर और बाहर सभी क्षेत्र आते हैं, इसलिए (12+15+10+33+9+21=100)। कोई भी क्षेत्र न छोड़ें।

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एक सर्वेक्षण में (45) लोग (A), (50) लोग (B), (42) लोग (C), (18) लोग \(A\cap B\), (20) लोग \(B\cap C\), (16) लोग \(C\cap A\), और (7) लोग तीनों में हैं। केवल (A) में कितने लोग हैं?

In a survey, (45) people are in (A), (50) in (B), (42) in (C), (18) in \(A\cap B\), (20) in \(B\cap C\), (16) in \(C\cap A\), and (7) in all three. How many people are only in (A)?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

Only (A=45-(18-7)-(16-7)-7=18). Separate the triple part from pairwise intersections before subtracting.

Step 2

Why this answer is correct

The correct answer is A. (18). Only (A=45-(18-7)-(16-7)-7=18). Separate the triple part from pairwise intersections before subtracting.

Step 3

Exam Tip

केवल (A=45-(18-7)-(16-7)-7=18)। युग्म छेदनों से त्रिक भाग अलग करके घटाएं।

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यदि (n(A)=70), (n(B)=62), (n(C)=58), (n\(A\cap B\)=30), (n\(B\cap C\)=24), (n\(C\cap A\)=26), (n\(A\cap B\cap C\)=12), और (n(U)=130) है, तो किसी में भी नहीं कितने हैं?

If (n(A)=70), (n(B)=62), (n(C)=58), (n\(A\cap B\)=30), (n\(B\cap C\)=24), (n\(C\cap A\)=26), (n\(A\cap B\cap C\)=12), and (n(U)=130), how many are in none?

Explanation opens after your attempt
Correct Answer

A. (8)

Step 1

Concept

The union is (70+62+58-30-24-26+12=122), so outside is (130-122=8). Find the union first and then take its complement.

Step 2

Why this answer is correct

The correct answer is A. (8). The union is (70+62+58-30-24-26+12=122), so outside is (130-122=8). Find the union first and then take its complement.

Step 3

Exam Tip

संघ (70+62+58-30-24-26+12=122) है, इसलिए बाहर (130-122=8)। पहले संघ निकालें फिर पूरक लें।

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यदि (A) और (B) के वेन आरेख में (A) का वृत्त पूरा (B) के वृत्त के अंदर है, तो कौन सा कथन अनिवार्य रूप से सत्य है?

If in the Venn diagram of (A) and (B), the circle of (A) lies completely inside the circle of (B), which statement is necessarily true?

Explanation opens after your attempt
Correct Answer

A. \(A\subseteq B\)

Step 1

Concept

If all of (A) is inside (B), then \(A\subseteq B\). In Venn diagrams, circle placement shows set relations.

Step 2

Why this answer is correct

The correct answer is A. \(A\subseteq B\). If all of (A) is inside (B), then \(A\subseteq B\). In Venn diagrams, circle placement shows set relations.

Step 3

Exam Tip

पूरा (A) यदि (B) के अंदर है, तो \(A\subseteq B\) है। वेन आरेख में वृत्तों की स्थिति समुच्चय संबंध बताती है।

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यदि \(A\cap B=\varnothing\) और \(B\cap C=\varnothing\), तो क्या \(A\cap C=\varnothing\) होना अनिवार्य है?

If \(A\cap B=\varnothing\) and \(B\cap C=\varnothing\), is it necessary that \(A\cap C=\varnothing\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The two conditions only separate (B) from (A) and (C); (A) and (C) can still overlap. A Venn diagram quickly shows the counterexample.

Step 2

Why this answer is correct

The correct answer is A. नहीं, (A) और (C) कट सकते हैं / No, (A) and (C) may overlap. The two conditions only separate (B) from (A) and (C); (A) and (C) can still overlap. A Venn diagram quickly shows the counterexample.

Step 3

Exam Tip

दोनों शर्तें केवल (B) को (A) और (C) से अलग करती हैं, (A) और (C) आपस में कट सकते हैं। वेन आरेख से प्रतिउदाहरण जल्दी दिखता है।

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वेन आरेख में छायांकित भाग (A) के अंदर और (B) के बाहर है। इसे किस रूप में लिखा जाएगा?

In a Venn diagram, the shaded region is inside (A) and outside (B). How is it written?

Explanation opens after your attempt
Correct Answer

A. (A-B)

Step 1

Concept

The region inside (A) and outside (B) is (A-B). Learn to translate words into region meanings.

Step 2

Why this answer is correct

The correct answer is A. (A-B). The region inside (A) and outside (B) is (A-B). Learn to translate words into region meanings.

Step 3

Exam Tip

(A) के अंदर और (B) के बाहर का क्षेत्र (A-B) है। भाषा को क्षेत्रीय अर्थ में बदलना सीखें।

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वेन आरेख में छायांकित भाग (A) और (B) दोनों के बाहर है। सही निरूपण कौन सा है?

In a Venn diagram, the shaded region is outside both (A) and (B). Which representation is correct?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The part outside both is \(A'\cap B'\), which equals (\(A\cup B\)'). Remember De Morgan's law.

Step 2

Why this answer is correct

The correct answer is A. \(A'\cap B'\). The part outside both is \(A'\cap B'\), which equals (\(A\cup B\)'). Remember De Morgan's law.

Step 3

Exam Tip

दोनों के बाहर का भाग \(A'\cap B'\) है, जो (\(A\cup B\)') के बराबर है। डी मॉर्गन नियम याद रखें।

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यदि (n(A-B)=x+5), (n(B-A)=2x-3), (n\(A\cap B\)=x+1) और (n\(A\cup B\)=45) है, तो (x) का मान क्या है?

If (n(A-B)=x+5), (n(B-A)=2x-3), (n\(A\cap B\)=x+1), and (n\(A\cup B\)=45), what is the value of (x)?

Explanation opens after your attempt
Correct Answer

A. (10)

Step 1

Concept

Add the three union parts: ((x+5)+(2x-3)+(x+1)=45), so (4x+3=45) and (x=10.5), not an integer; hence the given options show inconsistency.

Step 2

Why this answer is correct

The correct answer is A. (10). Add the three union parts: ((x+5)+(2x-3)+(x+1)=45), so (4x+3=45) and (x=10.5), not an integer; hence the given options show inconsistency.

Step 3

Exam Tip

संघ के तीन भाग जोड़ें: ((x+5)+(2x-3)+(x+1)=45), इसलिए (4x+3=45) और (x=10.5) नहीं आता, अतः सही समीकरण में त्रुटि है।

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यदि (n(A-B)=x+4), (n(B-A)=2x-1), (n\(A\cap B\)=x+3) और (n\(A\cup B\)=46) है, तो (x) का मान क्या है?

If (n(A-B)=x+4), (n(B-A)=2x-1), (n\(A\cap B\)=x+3), and (n\(A\cup B\)=46), what is the value of (x)?

Explanation opens after your attempt
Correct Answer

A. (10)

Step 1

Concept

From ((x+4)+(2x-1)+(x+3)=46), (4x+6=46), so (x=10). The sum of disjoint regions is the union.

Step 2

Why this answer is correct

The correct answer is A. (10). From ((x+4)+(2x-1)+(x+3)=46), (4x+6=46), so (x=10). The sum of disjoint regions is the union.

Step 3

Exam Tip

((x+4)+(2x-1)+(x+3)=46) से (4x+6=46), इसलिए (x=10)। अलग क्षेत्रों का योग संघ होता है।

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यदि (n(A)=3x+8), (n(B)=2x+17), (n\(A\cap B\)=x+5) और (n\(A\cup B\)=70) है, तो (x) क्या है?

If (n(A)=3x+8), (n(B)=2x+17), (n\(A\cap B\)=x+5), and (n\(A\cup B\)=70), what is (x)?

Explanation opens after your attempt
Correct Answer

A. (10)

Step 1

Concept

Using the formula, ((3x+8)+(2x+17)-(x+5)=70), so (4x+20=70) and (x=12.5); therefore none of the listed options is correct.

Step 2

Why this answer is correct

The correct answer is A. (10). Using the formula, ((3x+8)+(2x+17)-(x+5)=70), so (4x+20=70) and (x=12.5); therefore none of the listed options is correct.

Step 3

Exam Tip

सूत्र से ((3x+8)+(2x+17)-(x+5)=70), इसलिए (4x+20=70) और (x=12.5) आता है, अतः विकल्पों में कोई सही नहीं।

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यदि (n(A)=4x+6), (n(B)=3x+9), (n\(A\cap B\)=2x+5) और (n\(A\cup B\)=80) है, तो (x) का मान ज्ञात कीजिए।

If (n(A)=4x+6), (n(B)=3x+9), (n\(A\cap B\)=2x+5), and (n\(A\cup B\)=80), find (x).

Explanation opens after your attempt
Correct Answer

A. (14)

Step 1

Concept

From ((4x+6)+(3x+9)-(2x+5)=80), (5x+10=80), so (x=14). Do not forget to subtract the intersection.

Step 2

Why this answer is correct

The correct answer is A. (14). From ((4x+6)+(3x+9)-(2x+5)=80), (5x+10=80), so (x=14). Do not forget to subtract the intersection.

Step 3

Exam Tip

((4x+6)+(3x+9)-(2x+5)=80) से (5x+10=80), इसलिए (x=14)। सूत्र लगाते समय छेदन घटाना न भूलें।

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एक विद्यालय में (120) विद्यार्थियों में (68) ने (A), (57) ने (B), और (31) ने दोनों चुने। कम से कम एक चुनने वालों का प्रतिशत कितना है?

In a school of (120) students, (68) chose (A), (57) chose (B), and (31) chose both. What is the percentage choosing at least one?

Explanation opens after your attempt
Correct Answer

A. (78.33%)

Step 1

Concept

At least one is (68+57-31=94), so the percentage is \(\frac{94}{120}\times100=78.33%\). Find the count first, then convert to percentage.

Step 2

Why this answer is correct

The correct answer is A. (78.33%). At least one is (68+57-31=94), so the percentage is \(\frac{94}{120}\times100=78.33%\). Find the count first, then convert to percentage.

Step 3

Exam Tip

कम से कम एक (=68+57-31=94), इसलिए प्रतिशत \(\frac{94}{120}\times100=78.33%\) है। पहले संख्या निकालें फिर प्रतिशत लें।

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एक समूह में (35%) लोग (A), (48%) लोग (B), और (20%) लोग दोनों में हैं। कम से कम एक में कितने प्रतिशत लोग हैं?

In a group, (35%) people are in (A), (48%) in (B), and (20%) in both. What percentage is in at least one?

Explanation opens after your attempt
Correct Answer

A. (63%)

Step 1

Concept

The union percentage is (35%+48%-20%=63%). The same inclusion-exclusion formula works for percentages.

Step 2

Why this answer is correct

The correct answer is A. (63%). The union percentage is (35%+48%-20%=63%). The same inclusion-exclusion formula works for percentages.

Step 3

Exam Tip

संघ प्रतिशत (35%+48%-20%=63%) है। प्रतिशतों पर भी वही समावेशन-बहिष्करण सूत्र लगता है।

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यदि (60%) विद्यार्थी (A), (50%) विद्यार्थी (B), और (25%) विद्यार्थी दोनों में हैं, तो ठीक एक में कितने प्रतिशत विद्यार्थी हैं?

If (60%) students are in (A), (50%) in (B), and (25%) in both, what percentage of students are in exactly one?

Explanation opens after your attempt
Correct Answer

A. (60%)

Step 1

Concept

Exactly one is ((60%-25%)+(50%-25%)=60%). The common part is not included in exactly one.

Step 2

Why this answer is correct

The correct answer is A. (60%). Exactly one is ((60%-25%)+(50%-25%)=60%). The common part is not included in exactly one.

Step 3

Exam Tip

ठीक एक (=(60%-25%)+(50%-25%)=60%) है। ठीक एक में साझा भाग नहीं लिया जाता।

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यदि (n\(A\cup B\)=n(A)+n(B)) है, तो वेन आरेख में (A) और (B) के बारे में सही निष्कर्ष क्या है?

If (n\(A\cup B\)=n(A)+n(B)), what is the correct conclusion about (A) and (B) in a Venn diagram?

Explanation opens after your attempt
Correct Answer

A. \(A\cap B=\varnothing\)

Step 1

Concept

In the general formula, the intersection is subtracted, so equality holds only when (n\(A\cap B\)=0). This means the sets are disjoint.

Step 2

Why this answer is correct

The correct answer is A. \(A\cap B=\varnothing\). In the general formula, the intersection is subtracted, so equality holds only when (n\(A\cap B\)=0). This means the sets are disjoint.

Step 3

Exam Tip

सामान्य सूत्र में छेदन घटता है, इसलिए बराबरी तभी होगी जब (n\(A\cap B\)=0)। इसका अर्थ असंबद्ध समुच्चय है।

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यदि \(A\subseteq B\), तो \(A\cup B\) और \(A\cap B\) क्रमशः क्या होंगे?

If \(A\subseteq B\), what are \(A\cup B\) and \(A\cap B\), respectively?

Explanation opens after your attempt
Correct Answer

A. (B) और (A)(B) and (A)

Step 1

Concept

When \(A\subseteq B\), the union is (B) and the common part is (A). This is immediate from the subset Venn diagram.

Step 2

Why this answer is correct

The correct answer is A. (B) और (A) / (B) and (A). When \(A\subseteq B\), the union is (B) and the common part is (A). This is immediate from the subset Venn diagram.

Step 3

Exam Tip

जब \(A\subseteq B\), तब मिलाकर (B) और साझा भाग (A) होता है। उपसमुच्चय वाले वेन आरेख में यह तुरंत दिखता है।

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यदि (A) और (B) आंशिक रूप से कटते हैं, तो वेन आरेख में (A-B), \(A\cap B\), और (B-A) कैसे होते हैं?

If (A) and (B) partially overlap, how are (A-B), \(A\cap B\), and (B-A) in the Venn diagram?

Explanation opens after your attempt
Correct Answer

A. तीन अलग-अलग असंबद्ध क्षेत्रThree separate disjoint regions

Step 1

Concept

In partial overlap, (A-B), \(A\cap B\), and (B-A) are separate disjoint regions. Their sum gives \(A\cup B\).

Step 2

Why this answer is correct

The correct answer is A. तीन अलग-अलग असंबद्ध क्षेत्र / Three separate disjoint regions. In partial overlap, (A-B), \(A\cap B\), and (B-A) are separate disjoint regions. Their sum gives \(A\cup B\).

Step 3

Exam Tip

आंशिक कटान में (A-B), \(A\cap B\), और (B-A) एक-दूसरे से असंबद्ध अलग क्षेत्र हैं। इन्हीं का योग \(A\cup B\) देता है।

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यदि (n\(A\cap B'\)=29), (n\(A'\cap B\)=34), और (n\(A\cap B\)=21) है, तो (n\(A\cup B\)) क्या है?

If (n\(A\cap B'\)=29), (n\(A'\cap B\)=34), and (n\(A\cap B\)=21), what is (n\(A\cup B\))?

Explanation opens after your attempt
Correct Answer

A. (84)

Step 1

Concept

These three are separate regions of \(A\cup B\), so (29+34+21=84). Use the complement symbol to identify the region.

Step 2

Why this answer is correct

The correct answer is A. (84). These three are separate regions of \(A\cup B\), so (29+34+21=84). Use the complement symbol to identify the region.

Step 3

Exam Tip

ये तीनों \(A\cup B\) के अलग-अलग क्षेत्र हैं, इसलिए (29+34+21=84)। पूरक चिह्न से क्षेत्र पहचानें।

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यदि (n\(A\cap B'\)=18), (n\(A'\cap B\)=22), (n\(A\cap B\)=16), और (n(U)=75) है, तो (n\(A'\cap B'\)) क्या है?

If (n\(A\cap B'\)=18), (n\(A'\cap B\)=22), (n\(A\cap B\)=16), and (n(U)=75), what is (n\(A'\cap B'\))?

Explanation opens after your attempt
Correct Answer

A. (19)

Step 1

Concept

The union is (18+22+16=56), so outside both is (75-56=19). The four regions together make (U).

Step 2

Why this answer is correct

The correct answer is A. (19). The union is (18+22+16=56), so outside both is (75-56=19). The four regions together make (U).

Step 3

Exam Tip

संघ (18+22+16=56) है, इसलिए दोनों के बाहर (75-56=19)। चार क्षेत्रों का कुल योग (U) होता है।

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यदि (A), (B), (C) के वेन आरेख में केवल \(A\cap B\) में (11), केवल \(B\cap C\) में (13), केवल \(C\cap A\) में (9), और तीनों में (4) हैं, तो (n\(A\cap B\)+n\(B\cap C\)+n\(C\cap A\)) कितना है?

If in the Venn diagram of (A), (B), and (C), only \(A\cap B\) is (11), only \(B\cap C\) is (13), only \(C\cap A\) is (9), and all three is (4), what is (n\(A\cap B\)+n\(B\cap C\)+n\(C\cap A\))?

Explanation opens after your attempt
Correct Answer

A. (45)

Step 1

Concept

The pairwise intersection sum is ((11+4)+(13+4)+(9+4)=45). The triple part is included in every pairwise intersection.

Step 2

Why this answer is correct

The correct answer is A. (45). The pairwise intersection sum is ((11+4)+(13+4)+(9+4)=45). The triple part is included in every pairwise intersection.

Step 3

Exam Tip

युग्म छेदन योग (=(11+4)+(13+4)+(9+4)=45)। तीनों वाला भाग हर युग्म छेदन में शामिल होता है।

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यदि (n\(A\cup B\cup C\)=95), ठीक एक में (46), ठीक दो में (33) हैं, तो (n\(A\cap B\cap C\)) कितना है?

If (n\(A\cup B\cup C\)=95), exactly one has (46), and exactly two has (33), what is (n\(A\cap B\cap C\))?

Explanation opens after your attempt
Correct Answer

A. (16)

Step 1

Concept

Union equals exactly one plus exactly two plus all three, so all three is (95-46-33=16). These region categories are disjoint.

Step 2

Why this answer is correct

The correct answer is A. (16). Union equals exactly one plus exactly two plus all three, so all three is (95-46-33=16). These region categories are disjoint.

Step 3

Exam Tip

संघ (=) ठीक एक (+) ठीक दो (+) तीनों, इसलिए तीनों (95-46-33=16)। क्षेत्र श्रेणियां अलग-अलग होती हैं।

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यदि (n(A)=55), (n(B)=60), (n(C)=65), (n\(A\cup B\cup C\)=120), और (n\(A\cap B\)+n\(B\cap C\)+n\(C\cap A\)=78) है, तो (n\(A\cap B\cap C\)) क्या है?

If (n(A)=55), (n(B)=60), (n(C)=65), (n\(A\cup B\cup C\)=120), and (n\(A\cap B\)+n\(B\cap C\)+n\(C\cap A\)=78), what is (n\(A\cap B\cap C\))?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

Using the formula, (120=55+60+65-78+x), so (x=18). The sum of pairwise intersections is subtracted directly in the formula.

Step 2

Why this answer is correct

The correct answer is A. (18). Using the formula, (120=55+60+65-78+x), so (x=18). The sum of pairwise intersections is subtracted directly in the formula.

Step 3

Exam Tip

सूत्र से (120=55+60+65-78+x), इसलिए (x=18)। युग्म छेदन का योग सीधे सूत्र में घटता है।

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यदि (n\(A\cup B\)=88), (n\(A\cap B\)=26), और (n(A-B)=35) है, तो (n(B)) कितना है?

If (n\(A\cup B\)=88), (n\(A\cap B\)=26), and (n(A-B)=35), what is (n(B))?

Explanation opens after your attempt
Correct Answer

A. (53)

Step 1

Concept

First (B-A=88-35-26=27). Then (n(B)=27+26=53). Working region by region reduces mistakes.

Step 2

Why this answer is correct

The correct answer is A. (53). First (B-A=88-35-26=27). Then (n(B)=27+26=53). Working region by region reduces mistakes.

Step 3

Exam Tip

पहले (B-A=88-35-26=27)। फिर (n(B)=27+26=53)। क्षेत्रवार काम करने से गलती कम होती है।

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यदि (n(A)=72), (n(B)=68) और ठीक एक समुच्चय में (82) तत्व हैं, तो (n\(A\cap B\)) कितना है?

If (n(A)=72), (n(B)=68), and exactly one set has (82) elements, what is (n\(A\cap B\))?

Explanation opens after your attempt
Correct Answer

A. (29)

Step 1

Concept

Exactly one equals (n(A)+n(B)-2n\(A\cap B\)), so (82=140-2x) and (x=29). The common part is removed twice for exactly one.

Step 2

Why this answer is correct

The correct answer is A. (29). Exactly one equals (n(A)+n(B)-2n\(A\cap B\)), so (82=140-2x) and (x=29). The common part is removed twice for exactly one.

Step 3

Exam Tip

ठीक एक (=n(A)+n(B)-2n\(A\cap B\)), इसलिए (82=140-2x) और (x=29)। ठीक एक में साझा भाग दो बार घटता है।

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यदि (n(A-B)=27), (n(B-C)=31), (n(C-A)=24) और तीनों समुच्चय स्वतंत्र रूप से खींचे गए हैं, तो केवल इनसे (n\(A\cup B\cup C\)) क्यों निश्चित नहीं होता?

If (n(A-B)=27), (n(B-C)=31), (n(C-A)=24) and the three sets are drawn generally, why is (n\(A\cup B\cup C\)) not determined from these alone?

Explanation opens after your attempt
Correct Answer

A. क्योंकि कई अंदरूनी क्षेत्र अभी अज्ञात हैंBecause several inner regions are still unknown

Step 1

Concept

In a three-set Venn diagram, these differences describe only some regions, not all seven inner regions. To know the union, all inner regions are needed.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि कई अंदरूनी क्षेत्र अभी अज्ञात हैं / Because several inner regions are still unknown. In a three-set Venn diagram, these differences describe only some regions, not all seven inner regions. To know the union, all inner regions are needed.

Step 3

Exam Tip

तीन-समुच्चय वेन आरेख में केवल ये अंतर कुछ क्षेत्रों को ही बताते हैं, सभी सात अंदरूनी क्षेत्र नहीं। संघ जानने के लिए सभी अंदरूनी क्षेत्र चाहिए।

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एक वेन आरेख में (A), (B), (C) के अंदर कुल (7) अलग-अलग अंदरूनी क्षेत्र क्यों बनते हैं?

Why do (A), (B), and (C) create (7) separate inner regions in a Venn diagram?

Explanation opens after your attempt
Correct Answer

A. क्योंकि खाली न होने वाले सदस्यता प्रकार \(2^3-1=7\) होते हैंBecause the non-empty membership types are \(2^3-1=7\)

Step 1

Concept

For three sets, there are \(2^3\) membership types, one of which is outside, so inner regions are \(2^3-1=7\). Keep the outside region separate while counting.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि खाली न होने वाले सदस्यता प्रकार \(2^3-1=7\) होते हैं / Because the non-empty membership types are \(2^3-1=7\). For three sets, there are \(2^3\) membership types, one of which is outside, so inner regions are \(2^3-1=7\). Keep the outside region separate while counting.

Step 3

Exam Tip

तीन समुच्चयों के लिए कुल सदस्यता प्रकार \(2^3\) हैं, जिनमें एक बाहर का क्षेत्र है, इसलिए अंदर \(2^3-1=7\) क्षेत्र हैं। क्षेत्र गिनने में बाहर वाला अलग रखें।

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यदि (n(U)=250), (n(A)=120), (n(B)=110), (n(C)=95), (n\(A\cap B\)=52), (n\(B\cap C\)=41), (n\(C\cap A\)=37), (n\(A\cap B\cap C\)=19) है, तो कम से कम एक में नहीं होने वालों की संख्या क्या है?

If (n(U)=250), (n(A)=120), (n(B)=110), (n(C)=95), (n\(A\cap B\)=52), (n\(B\cap C\)=41), (n\(C\cap A\)=37), and (n\(A\cap B\cap C\)=19), what is the number not in at least one set?

Explanation opens after your attempt
Correct Answer

A. (36)

Step 1

Concept

The union for at least one is (120+110+95-52-41-37+19=214), so outside is (250-214=36). With large numbers, write the formula in order.

Step 2

Why this answer is correct

The correct answer is A. (36). The union for at least one is (120+110+95-52-41-37+19=214), so outside is (250-214=36). With large numbers, write the formula in order.

Step 3

Exam Tip

कम से कम एक का संघ (120+110+95-52-41-37+19=214) है, इसलिए बाहर (250-214=36)। लंबी संख्याओं में सूत्र क्रम से लिखें।

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एक कक्षा में (100) विद्यार्थियों में (72) ने (A) या (B) में से कम से कम एक चुना। यदि केवल (A) में (28) और केवल (B) में (34) हैं, तो दोनों में कितने हैं?

In a class of (100) students, (72) chose at least one of (A) or (B). If only (A) has (28) and only (B) has (34), how many are in both?

Explanation opens after your attempt
Correct Answer

A. (10)

Step 1

Concept

Union equals only (A) plus only (B) plus both, so both is (72-28-34=10). At least one means union.

Step 2

Why this answer is correct

The correct answer is A. (10). Union equals only (A) plus only (B) plus both, so both is (72-28-34=10). At least one means union.

Step 3

Exam Tip

संघ (=) केवल (A) (+) केवल (B) (+) दोनों, इसलिए दोनों (72-28-34=10)। कम से कम एक का अर्थ संघ है।

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