" The coefficient of "x^(5)" in the expansion of "(1+x)^(21)+(1+x)^(22)+...+(1+x)^(3:)" is "

The coefficient of x^(5) in the expansion of (1 +x)^(21) +(1 + x)^(22) + . . . +(1+x)^(30) is

The coefficient of x^(5) in the expansion of (1+x^(2))(1+x)^(4) is

The coefficient of x^(5) in the expansion of (1+x)^(21)+(1+x)^(22)+.. .+(1+x)^(30) is

Find the coefficient of x^(5) in the expansion of (1+x)^(21)+(1+x)^(22)+...+(1+x)^(30)

The coefficient of x^5 in the expansion of (1+x^2)(1+x)^4 is

If coefficient of x^(21) in the expansion of (1 + x)^(21) + (1 + x)^(22) + ... + (1 + x)^(30) is ""^(31)C_(r) , where r ge 20 , then r= ___

The coefficient of x^(3) in the expansion of (1-x+x^(2))^(5) is

The coefficient of x^(3) in the expansion of (1-x+x^(2))^(5) is