Find the value of 3sum(n=1)^(oo) {1/(pi)...

Find the value of `3sum_(n=1)^(oo) {1/(pi) sum_(k=1)^(oo) cot^(-1)(1+2sqrt(sum_(r=1)^(k)r^(3)))}^(n)`

A

e

B

`e^2 + e `

C

`e^2`

D

`e^2 -e `

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The correct Answer is:

D

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