यदि \(A=\{2,3,5,7\}\) है तो ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें (2) हो पर (7) न हो?
If \(A=\{2,3,5,7\}\) then how many subsets contain (2) but do not contain (7)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
(2) is fixed and (7) is excluded, while (3,5) are free. Hence the number is \(2^2=4\).
Why this answer is correct
The correct answer is B. (4). (2) is fixed and (7) is excluded, while (3,5) are free. Hence the number is \(2^2=4\).
Exam Tip
(2) निश्चित है और (7) हटेगा, बाकी (3,5) स्वतंत्र हैं। इसलिए संख्या \(2^2=4\) है।
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