यदि (n=5) और (r=2) हो तो \({}^{n}P_{r}\) का मान क्या है?
If (n=5) and (r=2), what is the value of \({}^{n}P_{r}\)?
Explanation opens after your attempt
A. (20)
Concept
\({}^{5}P_{2}=5\times4=20\). Start from (n) and take (r) decreasing factors.
Why this answer is correct
The correct answer is A. (20). \({}^{5}P_{2}=5\times4=20\). Start from (n) and take (r) decreasing factors.
Exam Tip
\({}^{5}P_{2}=5\times4=20\)। (n) से शुरू करके (r) तक घटते गुणनखंड लें।
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