Justify the equations in either by deriving them from

Chapter 9, Problem 6E

(choose chapter or problem)

Justify the equations in either by deriving them from formulas in Example or by direct computation from Theorem Assume m, n, k, and r are integers.ExampleValues of Think of Theorem as a general template: Regardless of what nonnegative numbers are placed in the boxes, if the number in the lower box is no greater than the number in the top box, then Use Theorem to show that for all integers n ? 0, Solution TheoremThe number of subsets of size r (or r-combinations) that can be chosen from a set of n elements, , is given by the formula or, equivalently where n and r are nonnegative integers with r ? n.