(9) अवयवों वाले समुच्चय में (3) विशेष अवयव हैं। (5) अवयवों के कितने उपसमुच्चय ठीक (2) विशेष अवयव रखते हैं?
A set of (9) elements has (3) special elements. How many (5)-element subsets contain exactly (2) special elements?
Explanation opens after your attempt
C. (60)
Concept
The selection is \( \binom{3}{2}\binom{6}{3}=60 \). With exactly (2) special elements, take the remaining (3) from ordinary elements.
Why this answer is correct
The correct answer is C. (60). The selection is \( \binom{3}{2}\binom{6}{3}=60 \). With exactly (2) special elements, take the remaining (3) from ordinary elements.
Exam Tip
चयन \( \binom{3}{2}\binom{6}{3}=60 \) है। ठीक (2) विशेष होने पर बाकी (3) सामान्य अवयवों से लें।
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