Maths, Functionx, Mathematics, Mathematics Education, Discrete Mathematics.
is k, the number of ways to choose 2 items from a 2 set with k elements. Similarly, the coefficient of xk+1 is the number of ways to choose k + 1 items from a size k set, which is zero. Building  that Count: we know that (1 + x)k generates the number of ways to select n distinct items from an