1.

If (1+x+x^(2))^(n)=a_(0)+a_(1)x+a_(2)x^(2)+….+a_(2n)x^(2n), then prove that a_(1)+a_(3)+a_(5)+….+a_(2n-1)=(3^(n)-1)/(2)

Answer»

`(3^n +1)/(2)`
`(3^(n)-1)/(2)`
`(3^(n+1))/(2)`
`(2^(n-1))/(2)`

ANSWER :B


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