1.

Coefficient of x^50 in (1+x)^1000 + 2x (1+x)^(999)+3x^2 (1+x)^(999) +…...+ 1001 x^(1000) is

Answer»

`""^(1001) C_50`
`""^(1000) C_(50)`
`""^(1002) C_(50)`
`""^(1002) C_(51)`

Answer :C


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