1.

If a_(k) = (1)/( k(k+1) ) for k= 1,2,3,….n then (sum_(k=1)^(n) a_(k) )=

Answer»

`(N)/( n+1)`
`(n^2)/( (n+1)^2)``(n^6)/( (n+1)^6)`

ANSWER :B


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