1.

IfP standsforP_(r)then the sum of the series1 + P_(1) + 2P_(2) + 3P_(3) + …+ nPn is

Answer»

<P>`P_(n+1)`
`P_(n+1) -1`
`P_(n+1)+1`
`.^(n+1)P_(n-1)`

ANSWER :B


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