यदि \(A=\{1,2,3,4,5\}\), तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें 1 हो और 2 न हो?
If \(A=\{1,2,3,4,5\}\), how many subsets contain 1 and do not contain 2?
Explanation opens after your attempt
B. 8
Concept
1 is fixed and 2 is excluded, while the remaining 3 elements are optional. Thus \(2^3=8\) subsets.
Why this answer is correct
The correct answer is B. 8. 1 is fixed and 2 is excluded, while the remaining 3 elements are optional. Thus \(2^3=8\) subsets.
Exam Tip
1 निश्चित है और 2 नहीं लेना है, शेष 3 अवयव स्वतंत्र हैं। इसलिए \(2^3=8\) उपसमुच्चय होंगे।
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