1.

If (3 + 7x - 9x^2)^n = a_0 +a_1x + a_2 x^2 + ……+a_(2n)x^(2n) prove the a_0 +a_1 +a_2 + ……+a_(2n) = 1

Answer»

0
`a_n`
`-a_n`
`a_(n-1)`

ANSWER :B


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