यदि \(A={x:x\in \mathbb{N}, x\leq 4}\) है तो (A) के उन उपसमुच्चयों की संख्या कितनी है जिनमें (4) हो?
If \(A={x:x\in \mathbb{N}, x\leq 4}\) then how many subsets of (A) contain (4)?
Explanation opens after your attempt
B. (8)
Concept
\(A=\{1,2,3,4\}\), and after fixing (4), the remaining (3) elements are free. Hence \(2^3=8\).
Why this answer is correct
The correct answer is B. (8). \(A=\{1,2,3,4\}\), and after fixing (4), the remaining (3) elements are free. Hence \(2^3=8\).
Exam Tip
\(A=\{1,2,3,4\}\) है और (4) निश्चित रखने पर बाकी (3) अवयव स्वतंत्र हैं। इसलिए \(2^3=8\) है।
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