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The nth term of a series of which all th...

The nth term of a series of which all the terms are positive is defined as `T_n = n^2 + n` then the sum of n terms of the series is :

A

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

B

`(n^3+4n)/n`

C

`(5n)/9[n^2+n]`

D

`(n(n+1)(n+2))/3`

Text Solution

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The correct Answer is:
D
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