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If (1 + ax)^n= 1 +8x+ 24x^2 +..... then...

If `(1 + ax)^n= 1 +8x+ 24x^2 +.....` then the value of a and n is

A

n =4, a =2

B

n = 5, a =1

C

n=8,a=3

D

n=8,a=2

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