यदि \(A=\{1,2,3,4\}\) है और \(B\subseteq A\) में ठीक दो तत्व हैं, तो ऐसे कितने (B), (\mathcal{P}(A)) के तत्व होंगे?
If \(A=\{1,2,3,4\}\) and \(B\subseteq A\) has exactly two elements, how many such (B) will be elements of (\mathcal{P}(A))?
Explanation opens after your attempt
Correct Answer
A. (6)
Concept
The number of two-element subsets is \(\binom{4}{2}=6\). In exams, remember elements of (\mathcal{P}(A)) are subsets.
Why this answer is correct
The correct answer is A. (6). The number of two-element subsets is \(\binom{4}{2}=6\). In exams, remember elements of (\mathcal{P}(A)) are subsets.
Exam Tip
दो तत्वों वाले उपसमुच्चयों की संख्या \(\binom{4}{2}=6\) है। परीक्षा में (\mathcal{P}(A)) के तत्व उपसमुच्चय होते हैं।
Login to save your score, XP, coins and progress.