Q 1384701657.     The coefficient of `x^7` in the expansion `(1-x-x^2+x^3)^6 ` is ?

A

`144`

B

`-144`

C

`132`

D

`-132`

HINT

`(1-x-x^2+x^3)^6=((1-x)(1-x^2))^6` `=(1-x)^{12}*(1+x)^6`
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