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Let (1+x+2x^(2))^(20) = a(0)+a(1)x+a(2)x...

Let `(1+x+2x^(2))^(20) = a_(0)+a_(1)x+a_(2)x^(2)+...+a_(40)x^(40)` then `a_(1)+a_(3)+a_(5)+...+a_(39)` is equal to

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