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If P(r) stands for ""^( r )P(r), then su...

If `P_(r)` stands for `""^( r )P_(r)`, then sum of the series `1+P_(1)+2P_(2)+3P_(3)+…+nP_(n)` is

A

`(n+1)!`

B

`P_(n+1)-1`

C

`P_(n-1)+1`

D

none of these

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The correct Answer is:
A
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MCGROW HILL PUBLICATION-PERMUTATIONS AND COMBINATIONS -EXERCISE (LEVEL 1) Single Correct Answer Type Questions
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