22. If in the expansion of $( 1 + x ) n$, the coefficients of $x$ and $x 2$ are 3 and - 6 respectively, then m is : (A) 6 (B) 9 (C) 12 (D) 24
22. If in the expansion of $( 1 + x ) n$, the coefficients of $x$ and $x 2$ are 3 and - 6 respectively, then m is :\\
(A) 6\\
(B) 9\\
(C) 12\\
(D) 24\\