Let n be a positive integer, such that ...

Let n be a positive integer, such that `(1 + x + x^2)^n=a_0 +a_1x+ a_2 x^2+a_3 x^3+......a_(2n) x^(2n)`, Answer the following question: The value of a when `(0 leq r leq n)` is (A) `a_(2n-r)` (B) `a_(n-r)` (C) `a_(2n)` (D) `n. a_(2n-1)`

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