ans is -30
taking (1-x) as one term of a binomial
expansion of the (1-x+x^2)^5
5C0(1-x)^5 + 5C1(1-x)^4 (x^2) rest of the terms of the expansion can be ignored as the coeficient of x becomes greater than 3 in them
now coeffient of x^3 in 5C0(1-x)^5
-(5C0)(5C3)
coeffient of x^3 in 5C1(1-x)^4 (x^2)...... FIND COEFFIENT OF X IN EXPANSION OF(1-x)^4
-(5C1)(4C1)
SO COEFFIENT OF X^3 IS -(5C1)(4C1) -(5C0)(5C3)
=-10-20= -30
cheers!!!
plz rate