यदि \(A=\{1,2,3,4\}\) है तो (A) के ऐसे उपसमुच्चयों की संख्या क्या है जिनमें (2) और (3) दोनों हों?
If \(A=\{1,2,3,4\}\), how many subsets of (A) contain both (2) and (3)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
(2) and (3) are fixed, while (1,4) are optional, so \(2^2=4\) subsets are obtained. Include fixed elements first.
Why this answer is correct
The correct answer is B. (4). (2) and (3) are fixed, while (1,4) are optional, so \(2^2=4\) subsets are obtained. Include fixed elements first.
Exam Tip
(2) और (3) निश्चित हैं तथा (1,4) स्वतंत्र हैं इसलिए \(2^2=4\) उपसमुच्चय मिलते हैं। निश्चित अवयवों को पहले शामिल करें।
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