If (1+ax)^(n)=1+6x+(27)/(2)x^(2)+-----+a...

If `(1+ax)^(n)=1+6x+(27)/(2)x^(2)+-----+a^(n)x^(n)` then the vlaue of a and n are respectively

A

(2,3)

B

(3,2)

C

`((3)/(2),4)`

D

`((3)/(2),6)`

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