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Sn=1/(1^3)+(1+2)/(1^3+2^3)+(1+2+3)/(1^3+...

`S_n=1/(1^3)+(1+2)/(1^3+2^3)+(1+2+3)/(1^3+2^3+3^3)+.........+(1+2+.....+n)/(1^3+2^3+......+n^3).100 S_n=n` then `n` is equal to :

A

199

B

99

C

200

D

19

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The correct Answer is:
A
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