यदि (|A|=4), तो (\mathcal{P}(A)) के कितने तत्वों में कम से कम (3) तत्व होंगे?
If (|A|=4), how many elements of (\mathcal{P}(A)) have at least (3) elements?
Explanation opens after your attempt
Correct Answer
B. (5)
Concept
Subsets with at least (3) elements have (3) or (4) elements. The number is \(\binom{4}{3}+\binom{4}{4}=5\).
Why this answer is correct
The correct answer is B. (5). Subsets with at least (3) elements have (3) or (4) elements. The number is \(\binom{4}{3}+\binom{4}{4}=5\).
Exam Tip
कम से कम (3) तत्वों वाले उपसमुच्चय (3) या (4) तत्वों के होंगे। संख्या \(\binom{4}{3}+\binom{4}{4}=5\) है।
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