Q .   I f   n N ,   p r o v e   t h a t   t h e   c o e f f i c i e n t   o f   x n   i n   1 + x + x 2 n i s   1 +   n n - 1 1 ! 2 + n n - 1 n - 2 n - 3 2 ! 2 + . . . . . .

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