(r(r-1){}^{n}C_r=n(n-1){}^{n-2}C_{r-2}) में (r(r-1)) किसे गिनता है?
What does (r(r-1)) count in (r(r-1){}^{n}C_r=n(n-1){}^{n-2}C_{r-2})?
Explanation opens after your attempt
Correct Answer
A. चुने हुए समूह में ordered दो marked सदस्यOrdered two marked members in the selected group
Concept
In an (r)-group, the first and second marked members are chosen with order. In exams think of ordered marking when you see (r(r-1)).
Why this answer is correct
The correct answer is A. चुने हुए समूह में ordered दो marked सदस्य / Ordered two marked members in the selected group. In an (r)-group, the first and second marked members are chosen with order. In exams think of ordered marking when you see (r(r-1)).
Exam Tip
(r)-समूह में पहला और दूसरा marked member क्रम सहित चुने जाते हैं। परीक्षा में (r(r-1)) देखकर ordered marking सोचें।
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