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The sum of coefficient in the expansion ...

The sum of coefficient in the expansion of `(1+a x-2x^2)^n` is (a)positive, when `a<1a n dn=2k ,k in N` (b)negative, when `a<1a n dn=2k+1,k in N` (c)positive, when `a<1a n dn in N` (d)zero, when `a=1`

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