underset(n to oo)(Lt) (3^(3)+6^(3)+...+(...

`underset(n to oo)(Lt) (3^(3)+6^(3)+...+(3n)^(3))/(3n^(4))=`

A

`(1)/(2)`

B

`(9)/(4)`

C

`(27)/(4)`

D

`(81)/(4)`

Verified by Experts

The correct Answer is:

B

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