यदि (r=n) हो तो \(^{n}P_r\) के formula में denominator कौन-सा होगा?
If (r=n) what will be the denominator in the formula of \(^{n}P_r\)?
Explanation opens after your attempt
B. (0!)
Concept
(^{n}P_n=\frac{n!}{(n-n)!}=\frac{n!}{0!}=n!). In exams take (0!) as (1).
Why this answer is correct
The correct answer is B. (0!). (^{n}P_n=\frac{n!}{(n-n)!}=\frac{n!}{0!}=n!). In exams take (0!) as (1).
Exam Tip
(^{n}P_n=\frac{n!}{(n-n)!}=\frac{n!}{0!}=n!) होता है। परीक्षा में (0!) को (1) मानें।
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