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Given (1-2x+5x^2-10 x^3)(1+x)^n=1+a1x+a2...

Given `(1-2x+5x^2-10 x^3)(1+x)^n=1+a_1x+a_2x^2+` and that`a1 2=2a_2` then the value of `n` is.

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