1.

(1)/(x(x+1)(x+2).....(x+n))=(A_(0))/(x)+(A_(1))/(x+1)+...+(A_(n))/(x+n) rArr A_(r)=(0 le r le n)

Answer»

`(-1)^(R)(r!)/((n-r)!)`
`(-1)^(r)(1)/(r!(n-r)!)`
`(1)/(r!(n-r)!)`
`(r!)/((n-r)!)`

ANSWER :B


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