1.

Let n be positive integer such that, (1+x+x^(2))^(n)=a_(0)+a_(1)x+a_(2)x^(2)+….+a_(2n)x^(2n), then (n-r)a_(r)+(2n-r+1)a_(r-1),0ltrlt2n is :

Answer»

`(r+1)a_(r+1)`
`(r-1)a_(r+1)`
`(2r+1)a_(r+1)`
NONE of these

ANSWER :A


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