I f   ( 1 + x ) n = c 0 + c 1 + c 2 x 2 + . . . . . . . + c n x n p r o v e   t h a t   c 1 + 2   c 2 + 3   c 3 + . . . . . . . . + n   c n = n 2 n - 1   
 

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