कौन-सा सूत्र \(^{n}P_r\) को फैक्टोरियल रूप में सही दिखाता है?
Which formula correctly shows \(^{n}P_r\) in factorial form?
Explanation opens after your attempt
Correct Answer
B. (^{n}P_r=\frac{n!}{(n-r)!})
Concept
In ordered selection the remaining ((n-r)!) part is removed from (n!). In exams remember ((n-r)!) in the denominator for permutation.
Why this answer is correct
The correct answer is B. (^{n}P_r=\frac{n!}{(n-r)!}). In ordered selection the remaining ((n-r)!) part is removed from (n!). In exams remember ((n-r)!) in the denominator for permutation.
Exam Tip
क्रम वाले चयन में (n!) से बाकी ((n-r)!) भाग हटता है। परीक्षा में permutation के हर में ((n-r)!) याद रखें।
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