(9) अवयवों वाले समुच्चय में (3) विशेष अवयव हैं। (5) अवयवों के ऐसे उपसमुच्चय कितने हैं जिनमें तीनों विशेष अवयव एक साथ न हों?
A set of (9) elements has (3) special elements. How many (5)-element subsets do not contain all three special elements together?
Explanation opens after your attempt
A. (111)
Concept
Subtract \( \binom{6}{2} \) subsets containing all three special elements from total \( \binom{9}{5} \), giving (111). In not-type questions, subtract forbidden selections.
Why this answer is correct
The correct answer is A. (111). Subtract \( \binom{6}{2} \) subsets containing all three special elements from total \( \binom{9}{5} \), giving (111). In not-type questions, subtract forbidden selections.
Exam Tip
कुल \( \binom{9}{5} \) से तीनों विशेष अवयवों वाले \( \binom{6}{2} \) घटाएँ, उत्तर (111) है। नहीं वाले प्रश्न में निषिद्ध चयन घटाएँ।
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