1.

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

Answer»

`(N)/(n+1)`
`(n^(2))/((n+1)^(2))`
`(n^(4))/((n+1)^(4))`
`(n^(6))/((n+1)^(6))`

ANSWER :B


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