यदि \(A=\{1,2,3,4,5\}\), तो (1) को शामिल और (5) को बाहर रखने वाले उपसमुच्चयों की संख्या कितनी है?
If \(A=\{1,2,3,4,5\}\), how many subsets contain (1) and exclude (5)?
Explanation opens after your attempt
B. (8)
Concept
Element (1) is fixed, (5) is forbidden, and (2,3,4) are free. Hence \(2^3=8\).
Why this answer is correct
The correct answer is B. (8). Element (1) is fixed, (5) is forbidden, and (2,3,4) are free. Hence \(2^3=8\).
Exam Tip
(1) निश्चित है, (5) निषिद्ध है और (2,3,4) स्वतंत्र हैं। इसलिए \(2^3=8\) है।
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