(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
Correct Answer

A. (105)

Step 1

Concept

Total selections are \(^{9}C_{4}=126\). Remove \(^{7}C_{2}=21\) selections containing both rivals, answer (105).

Step 2

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).

Step 3

Exam Tip

कुल \(^{9}C_{4}=126\) हैं। दोनों विरोधी साथ होने पर \(^{7}C_{2}=21\) हटाएं, उत्तर (105)।

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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: A. (105). Explanation: कुल \(^{9}C_{4}=126\) हैं। दोनों विरोधी साथ होने पर \(^{7}C_{2}=21\) हटाएं, उत्तर (105)। / Total selections are \(^{9}C_{4}=126\). Remove \(^{7}C_{2}=21\) selections containing both rivals, answer (105).

Which concept should I revise for this Mathematics MCQ?

Total selections are \(^{9}C_{4}=126\). Remove \(^{7}C_{2}=21\) selections containing both rivals, answer (105).

What exam hint can help solve this Mathematics question?

कुल \(^{9}C_{4}=126\) हैं। दोनों विरोधी साथ होने पर \(^{7}C_{2}=21\) हटाएं, उत्तर (105)।