Given Expression:
(1+x)1000+2x(1+x)999+3x2(1+x)998+⋯+1001x1000
This follows a known identity that simplifies the full expression to:
f(x)=(1+x)1002
Now: The coefficient of x50 in f(x) is:
(100250)
✅ Final Answer: (100250)
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