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"If" n in "and if "(1+ 4x +4 x^2)^n=unde...

`"If" n in "and if "(1+ 4x +4 x^2)^n=underset(r=0)overset(2n)Sigma a_rx^r, "where" a_0,a_1,a_2,.....a_(2n) "are real number" `
The value of ` 2 ` underset(r=0) overset (n) Sigma_(2r) ` is

A

`9^n-1`

B

`9 ^n+1`

C

`9^n-2`

D

`9^n +2`

Text Solution

Verified by Experts

The correct Answer is:
B
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