1.

The coefficient of x50 in the expansion of (1+x)1000+2x(1+x)999+3x2(1+x)998+......+1001 x1000

Answer»

The coefficient of x50 in the expansion of (1+x)1000+2x(1+x)999+3x2(1+x)998+......+1001 x1000



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