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Given (1-2x+5x^2-10x^3)(1+x)^n=1+a1x+a2x...

Given `(1-2x+5x^2-10x^3)(1+x)^n=1+a_1x+a_2x^2+...` and that `a_1^2=2a_2` then `n=`

A

6

B

2

C

5

D

3

Text Solution

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The correct Answer is:
A
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