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Find the sum of the series `1+2(1-x)+3(1-x)(1-2x)++n(1-x)(1-2x)(1-3x)[1-(n-1)x]` .

A

`S_(n) = -(1)/(x) [(1-x)(1-2x)"………"(1-nx)-1]`

B

`S_(n) = -(1)/(x) [(1-x)(1-2x)"………"(1-6x)-1]`

C

`S_(n) = (1)/(x) [(1-x)(1-2x)"………"(1-nx)-1]`

D

`S_(n) = (1)/(x) [(1-x)(1-2x)"………"(1-nx)-1]`

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A, B, D
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