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If (n) is an odd positive integer and ...

If `(n)` is an odd positive integer and
`(1+x+x^(2)+x^(3))^(n) = sum_(r=0)^(3 n) a_(r) x^(r) ` then, `a_(0)-a_(1)+a_(2)-a_(3)+.. .-a_(3 n) =`

A

`4^(n)`

B

1

C

`-1`

D

0

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