Hard Mathematics Sets Class 11 Level 9

यदि \(A=\{1,2,3,4,5\}\), तो ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें 1 अवश्य हो?

If \(A=\{1,2,3,4,5\}\), how many subsets must contain 1?

Explanation opens after your attempt
Correct Answer

B. 16

Step 1

Concept

Fix 1, and each of the remaining 4 elements may be chosen or not. So there are \(2^4=16\) subsets.

Step 2

Why this answer is correct

The correct answer is B. 16. Fix 1, and each of the remaining 4 elements may be chosen or not. So there are \(2^4=16\) subsets.

Step 3

Exam Tip

1 को निश्चित रखें और शेष 4 अवयवों को चुनना या न चुनना स्वतंत्र है। इसलिए \(2^4=16\) उपसमुच्चय मिलते हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3,4,5\}\), तो ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें 1 अवश्य हो? / If \(A=\{1,2,3,4,5\}\), how many subsets must contain 1?

Correct Answer: B. 16. Explanation: 1 को निश्चित रखें और शेष 4 अवयवों को चुनना या न चुनना स्वतंत्र है। इसलिए \(2^4=16\) उपसमुच्चय मिलते हैं। / Fix 1, and each of the remaining 4 elements may be chosen or not. So there are \(2^4=16\) subsets.

Which concept should I revise for this Mathematics MCQ?

Fix 1, and each of the remaining 4 elements may be chosen or not. So there are \(2^4=16\) subsets.

What exam hint can help solve this Mathematics question?

1 को निश्चित रखें और शेष 4 अवयवों को चुनना या न चुनना स्वतंत्र है। इसलिए \(2^4=16\) उपसमुच्चय मिलते हैं।

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