\(^{n}C_r\) के formula से \(^{n}C_{n-r}\) निकालने पर denominator में कौन-से factorial आते हैं?
Using the formula for \(^{n}C_r\), which factorials appear in the denominator of \(^{n}C_{n-r}\)?
Explanation opens after your attempt
Correct Answer
A. (r!(n-r)!)
Concept
(^{n}C_{n-r}=\frac{n!}{(n-r)!r!}), which gives the same denominator. In exams verify symmetry using factorials.
Why this answer is correct
The correct answer is A. (r!(n-r)!). (^{n}C_{n-r}=\frac{n!}{(n-r)!r!}), which gives the same denominator. In exams verify symmetry using factorials.
Exam Tip
(^{n}C_{n-r}=\frac{n!}{(n-r)!r!}) है जो वही denominator देता है। परीक्षा में symmetry को factorial से verify करें।
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