(9) वैज्ञानिकों में से (4) का दल बनाना है, पर दो विरोधी वैज्ञानिक साथ नहीं हो सकते। कितने दल बनेंगे?
A team of (4) is to be formed from (9) scientists, but two rival scientists cannot be together. How many teams are possible?
Explanation opens after your attempt
A. (105)
Concept
Total selections are \(^{9}C_{4}=126\). Remove \(^{7}C_{2}=21\) selections containing both rivals, answer (105).
Why this answer is correct
The correct answer is A. (105). Total selections are \(^{9}C_{4}=126\). Remove \(^{7}C_{2}=21\) selections containing both rivals, answer (105).
Exam Tip
कुल \(^{9}C_{4}=126\) हैं। दोनों विरोधी साथ होने पर \(^{7}C_{2}=21\) हटाएं, उत्तर (105)।
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