When (x - 1)(x - 2)(x - 3)(x - 4)(x - 5) is expanded, find the coefficient of x^3.
+107 When we expand (x - 1)(x - 2)(x - 3)(x - 4)(x - 5), we get
x^5 -15x^4 +85x^3 -225x^2 +274x -120.
It's a very big number, but we only have to find the coefficient of the number behind x^3, which is 85.
So the coefficient of x^3 is 85.
