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

If `(1+x+x^(2))^(20) = a_(0) + a_(1)x^(2) "……" + a_(40)x^(40)`, then following questions.
The value of `a_(0) + a_(1) + a_(2) + "……" + a_(19)` is

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