यदि \(A=\{1,2,3,4,5,6,7\}\) है, तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें (3) और (7) दोनों हों?

If \(A=\{1,2,3,4,5,6,7\}\), how many subsets of (A) contain both (3) and (7)?

Explanation opens after your attempt
Correct Answer

B. (32)

Step 1

Concept

Including (3) and (7) is fixed and the remaining (5) elements are free. So the number is \(2^5=32\).

Step 2

Why this answer is correct

The correct answer is B. (32). Including (3) and (7) is fixed and the remaining (5) elements are free. So the number is \(2^5=32\).

Step 3

Exam Tip

(3) और (7) को रखना तय है और बाकी (5) तत्व स्वतंत्र हैं। इसलिए संख्या \(2^5=32\) होगी।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3,4,5,6,7\}\) है, तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें (3) और (7) दोनों हों? / If \(A=\{1,2,3,4,5,6,7\}\), how many subsets of (A) contain both (3) and (7)?

Correct Answer: B. (32). Explanation: (3) और (7) को रखना तय है और बाकी (5) तत्व स्वतंत्र हैं। इसलिए संख्या \(2^5=32\) होगी। / Including (3) and (7) is fixed and the remaining (5) elements are free. So the number is \(2^5=32\).

Which concept should I revise for this Mathematics MCQ?

Including (3) and (7) is fixed and the remaining (5) elements are free. So the number is \(2^5=32\).

What exam hint can help solve this Mathematics question?

(3) और (7) को रखना तय है और बाकी (5) तत्व स्वतंत्र हैं। इसलिए संख्या \(2^5=32\) होगी।