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If (1+x-2x^2)^(20)=a0a1x=a2x^2+a3x^3++a(...

If `(1+x-2x^2)^(20)=a_0a_1x=a_2x^2+a_3x^3++a_(40)x^(40),` then find the value of `a_1+a_3+a_5++a_(39)dot`

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If (1+x-2x^2)^(20)=a_0+a_1x+a_2x^2+a_3x^3++a_(40)x^(40), then find the value of a_1+a_3+a_5++a_(39)dot

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