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If (1-x-x^2)^20=sum(r=0)^40ar.x^r, then...

If `(1-x-x^2)^20=sum_(r=0)^40a_r.x^r`, then

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If (1-x-x^(2))^(20)=sum_(r=0)^(40)a_(r)x^(r), then a_(1)+3a_(3)+5a_(5)+.......+39a_(39)=

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