यदि \(A=\{1,2,3,4\}\) है तो (A) के तीन तत्वों वाले उचित उपसमुच्चयों की संख्या कितनी है?
If \(A=\{1,2,3,4\}\) then how many proper subsets of (A) have exactly three elements?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
The number of ways to choose three elements is \({}^4C_3=4\) and all are proper subsets. In exams a subset with size less than (n) is proper.
Why this answer is correct
The correct answer is B. (4). The number of ways to choose three elements is \({}^4C_3=4\) and all are proper subsets. In exams a subset with size less than (n) is proper.
Exam Tip
तीन तत्व चुनने के तरीके \({}^4C_3=4\) हैं और ये सभी उचित उपसमुच्चय हैं। परीक्षा में आकार (n) से छोटा हो तो उपसमुच्चय उचित होता है।
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