Q .     The value of `1/((1+a)(2+a)) + 1/((2+a)(3+a))`

`+ 1/((3+a)(4+a)) + .....+ oo` is, ( where, `a` is a constant )

UPSEE 2012
A

`1/(1+a)`

B

`2/(1+a)`

C

`oo`

D

None of these

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