1.

(1.2^2+ 2.3^2 + 3.4^2+ .... + n(n+1)^2)/( 1^2. 2 +2^2. 3+ 3^2. 4+ ..... + n^2 (n+1) ) =

Answer»

`(3n+1)/( 3n+5)`
`(3n+5)/( 3n+1)`
`(3n+1)/(3n+5)`
`( 3n+5)/( 3n+7)`

ANSWER :B


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