यदि \(U={1,2,\ldots,20}\), (A) (4) के गुणजों का समुच्चय और (B) (6) के गुणजों का समुच्चय है, तो (n(\(A\cup B\)')) कितना है?

If \(U={1,2,\ldots,20}\), (A) is the set of multiples of (4), and (B) is the set of multiples of (6), what is (n(\(A\cup B\)'))?

Explanation opens after your attempt
Correct Answer

D. (13)

Step 1

Concept

There are (5) multiples of (4) and (3) multiples of (6), with (1) common multiple of (12). So the union has (7) elements and the complement has (20-7=13) elements.

Step 2

Why this answer is correct

The correct answer is D. (13). There are (5) multiples of (4) and (3) multiples of (6), with (1) common multiple of (12). So the union has (7) elements and the complement has (20-7=13) elements.

Step 3

Exam Tip

(4) के (5) और (6) के (3) गुणज हैं, जबकि (12) का केवल (1) साझा गुणज है। इसलिए संघ में (7) तत्व और पूरक में (20-7=13) तत्व होंगे।

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Mathematics Answer, Explanation and Revision Hints

यदि \(U={1,2,\ldots,20}\), (A) (4) के गुणजों का समुच्चय और (B) (6) के गुणजों का समुच्चय है, तो (n(\(A\cup B\)')) कितना है? / If \(U={1,2,\ldots,20}\), (A) is the set of multiples of (4), and (B) is the set of multiples of (6), what is (n(\(A\cup B\)'))?

Correct Answer: D. (13). Explanation: (4) के (5) और (6) के (3) गुणज हैं, जबकि (12) का केवल (1) साझा गुणज है। इसलिए संघ में (7) तत्व और पूरक में (20-7=13) तत्व होंगे। / There are (5) multiples of (4) and (3) multiples of (6), with (1) common multiple of (12). So the union has (7) elements and the complement has (20-7=13) elements.

Which concept should I revise for this Mathematics MCQ?

There are (5) multiples of (4) and (3) multiples of (6), with (1) common multiple of (12). So the union has (7) elements and the complement has (20-7=13) elements.

What exam hint can help solve this Mathematics question?

(4) के (5) और (6) के (3) गुणज हैं, जबकि (12) का केवल (1) साझा गुणज है। इसलिए संघ में (7) तत्व और पूरक में (20-7=13) तत्व होंगे।