1.

Sum to n terms the series (3)/(1 ^(2) . 2 ^(2)) + (5)/( 2 ^(2) . 3 ^(2)) + (7)/( 3 ^(2) . 4 ^(2)) +.............

Answer»


ANSWER :`(2N + N ^(2))/( (n +1 ) ^(2))`


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