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