1.

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

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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