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If (1+x+x^(2)+x^(3))^(7)=b(0)+b(1)x+b^(2...

If `(1+x+x^(2)+x^(3))^(7)=b_(0)+b_(1)x+b^(2)x^(2)+….b_(21)x^(21)`, then find the value of
`b_(1)+b_(3)+b_(5)+……+b_(21)`

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