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Value of 1+1/(1+2)+1/(1+2+3)+....+1/(1+2...

Value of `1+1/(1+2)+1/(1+2+3)+....+1/(1+2+3+....+n)` is equal to

A

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

B

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

C

`(4n)/(3n+1)`

D

none of these

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The correct Answer is:
A
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