Find the coefficients of `x^(50)` in the expression `(1+x)^(1000)+2x(1+x)^(999)+3x^2(1+x)^(998)++1001 x^(1000)` .

Find the coefficients of x^(50) in the expression (1+x)^(1000)+2x(1+x)^(999)+3x^(2)(1+x)^(998)+...+1001x^(1000)

Find the coefficients of x^(50) in the expression (1+x)^(1000)+x(1+x)^(999)+x^2(1+x)^(998)+...+1001 x^(1000) .

Find the coefficient of x^50 in the expression : (1 + x)^1000 + 2x(1 + x)^999 + 3x^2 (1 + x)^998 + ... + 1001 x^1000 .

Find the coefficient of x^(50) in the expansion of (1+x)^(101)xx(1-x+x^(2))^(100)

Find the coefficient of x^(50) in the expansion of (1+x)^(101)xx(1-x+x^2)^(100)dot

Find the coefficient of x^(50) in the expansion of (1+x)^(101)xx(1-x+x^2)^(100)dot