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Sum of the n terms of the series (3)/(1^...

Sum of the n terms of the series `(3)/(1^(2))+(5)/(1^(2)+2^(2))+(7)/(1^(2)+2^(2)+3^(3))+"......."` is

A

`n/(n+1)`

B

`(n+2)/(n+1)`

C

`(6n)/(n+1)`

D

`(6(n+2))/(n+1)` .

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MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
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