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Given a sequence t1, t2, ...... if its p...

Given a sequence `t_1, t_2, ......` if its possible to find a function `f(r)` such that `t_r=f(r + 1)-f(r)` then `sum_(n=1)^n t_r = f(n + 1) - f(1)` , Sum of the `sum_(r=1)^oo 1/(r(r+1)(r+2))` is (A)1 (B) `1/2` (C) `1/4` (D)`1/8`

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