(9) व्यक्तियों में से (4) व्यक्तियों की समिति बनानी है और (2) विशेष व्यक्ति साथ में नहीं चुने जा सकते। कितने तरीके होंगे?
A committee of (4) persons is to be formed from (9) persons and (2) special persons cannot be selected together. How many ways are possible?
Explanation opens after your attempt
C. (105)
Concept
Total ways are \(\binom{9}{4}=126\) and ways with both special persons are \(\binom{7}{2}=21\). Hence (126-21=105).
Why this answer is correct
The correct answer is C. (105). Total ways are \(\binom{9}{4}=126\) and ways with both special persons are \(\binom{7}{2}=21\). Hence (126-21=105).
Exam Tip
कुल \(\binom{9}{4}=126\) हैं और दोनों विशेष साथ हों तो \(\binom{7}{2}=21\) हैं। इसलिए (126-21=105) तरीके हैं।
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