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` underset (n rarr infty )(lim) [((n+1)(n+2)...3n)/(n^(2n))]^(1//n)` is equal to

A

`(18)/(e^4)`

B

`(27)/( e^2)`

C

`(9)/(e^2)`

D

`3 log 3-2`

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Verified by Experts

The correct Answer is:
B
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