(12) लोगों में से (5) चुनने हैं, पर तीन विशेष लोगों में से कम से कम (2) चुने जाएं। कितने चयन होंगे?
From (12) people, (5) are to be chosen, but at least (2) of (3) special people must be selected. How many selections are possible?
Explanation opens after your attempt
A. (225)
Concept
Cases are (2) special and (3) others, or (3) special and (2) others. The value is \(^{3}C_{2}{}^{9}C_{3}+^{3}C_{3}{}^{9}C_{2}=288\).
Why this answer is correct
The correct answer is A. (225). Cases are (2) special and (3) others, or (3) special and (2) others. The value is \(^{3}C_{2}{}^{9}C_{3}+^{3}C_{3}{}^{9}C_{2}=288\).
Exam Tip
मामले (2) विशेष और (3) अन्य, या (3) विशेष और (2) अन्य हैं। \(^{3}C_{2}{}^{9}C_{3}+^{3}C_{3}{}^{9}C_{2}=288\) होता है।
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