Q .     ` \lim_{n\rightarrow \infty} (\ frac {(n + 1) (n + 2) .....3n}{n^{2n}} )^{\frac {1}{n}} ` is equal to:

JEE 2016 Mains 3rd April
A

` frac {18}{e^{4}}`

B

`frac {27}{e^{2}}`

C

`frac {9}{e^{2}}`

D

`3\log 3 - 2`

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