यदि \(A=\{1,2,3,4\}\) है तो (A) के कितने उपसमुच्चय (1) रखते हैं लेकिन (4) नहीं रखते?
If \(A=\{1,2,3,4\}\) then how many subsets of (A) contain (1) but not (4)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
(1) is fixed and (4) is removed, so (2,3) are free and form \(2^2=4\) subsets. In exams separate included and excluded conditions.
Why this answer is correct
The correct answer is B. (4). (1) is fixed and (4) is removed, so (2,3) are free and form \(2^2=4\) subsets. In exams separate included and excluded conditions.
Exam Tip
(1) निश्चित है और (4) हट गया है इसलिए (2,3) स्वतंत्र हैं और \(2^2=4\) उपसमुच्चय बनते हैं। परीक्षा में शामिल और निष्कासित शर्तें अलग करें।
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