यदि \(A=\{2,3,5,7,11\}\), तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें 2 हो लेकिन 11 न हो?
If \(A=\{2,3,5,7,11\}\), how many subsets contain 2 but not 11?
Explanation opens after your attempt
Correct Answer
B. 8
Concept
2 is fixed and 11 is excluded, while the remaining 3 elements are optional. Hence \(2^3=8\) subsets.
Why this answer is correct
The correct answer is B. 8. 2 is fixed and 11 is excluded, while the remaining 3 elements are optional. Hence \(2^3=8\) subsets.
Exam Tip
2 निश्चित है और 11 निषिद्ध है, शेष 3 अवयव स्वतंत्र हैं। इसलिए \(2^3=8\) उपसमुच्चय हैं।
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