Q 1344001853.     In the expansion of `(1+x)^m.(1-x)^n`, the coefficients of `x` and `x^2` are ` 3` and `-6` respectively, then `m=`?

A

`24`

B

`12`

C

`6`

D

`9`

HINT

Use `(1+x)^m.(1-x)^n=` `[1+mx+{m(m-1)}/{2!}x^2+....] times[1-nx+{n(n-1)}/{2!}x^2+......]`

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