यदि \(A=\{1,2,3,4\}\) है तो (\mathcal{P}(A)) में कम से कम तीन तत्वों वाले उपसमुच्चयों की संख्या कितनी है?
If \(A=\{1,2,3,4\}\), how many subsets in (\mathcal{P}(A)) have at least three elements?
Explanation opens after your attempt
B. (5)
Concept
There are \({}^4C_3=4\) three-element subsets and (1) four-element subset. The total is (5).
Why this answer is correct
The correct answer is B. (5). There are \({}^4C_3=4\) three-element subsets and (1) four-element subset. The total is (5).
Exam Tip
तीन तत्वों वाले \({}^4C_3=4\) और चार तत्वों वाला (1) उपसमुच्चय है। कुल (5) हैं।
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