The coefficient of x^(9) in (1+9x+27x^(2...

The coefficient of `x^(9)` in `(1+9x+27x^(2)+27x^(3))^(6)` is

A

`""^(18)C_(9) cdot 3^(9)`

B

`""^(18)C_(8) cdot 3^(9)`

C

`""^(18)C_(10) cdot 3^(8)`

D

`""^(8)C_(9) cdot 3^(7)`

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The correct Answer is:

A

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