1.

If (1 -x+ x^2)^n = a_0 +a_1x + a_2x^2+….+a_(2n)x^(2n) then a_0 + a_2 +a_4 + …….+a_(2n) =

Answer»

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

ANSWER :A


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