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Given (1-2x+5x^(2)-10x^(3))(1+x)^(n)=1+a...

Given `(1-2x+5x^(2)-10x^(3))(1+x)^(n)=1+a_(1)x+a_(2)x^(2)+….`
and that `a_(1)^(2)=2a_(2)`, then the value of n is

A

6

B

2

C

5

D

3

Text Solution

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The correct Answer is:
A
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