1.

If n is a positive interger, then the coefficient of x^(6) in the expansion of (1-2x + 3x^(2) -4x^(3) + …)^(-n) is

Answer»

`""^((2n))C_(4)`
`""^(N)C_(12)`
`""^((2n))C_(6)`
`""^(n)C_(6)`

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