यदि \(A=\{1,2,3,4\}\), तो ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें ठीक 3 अवयव हों?
If \(A=\{1,2,3,4\}\), how many subsets have exactly 3 elements?
Explanation opens after your attempt
Correct Answer
B. 4
Concept
The number of ways to choose exactly 3 elements is \(\binom{4}{3}=4\). Changing order does not create a new subset.
Why this answer is correct
The correct answer is B. 4. The number of ways to choose exactly 3 elements is \(\binom{4}{3}=4\). Changing order does not create a new subset.
Exam Tip
ठीक 3 अवयव चुनने के तरीके \(\binom{4}{3}=4\) हैं। क्रम बदलने से नया उपसमुच्चय नहीं बनता।
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