The CEO of Accounting Credits Inc. wants to implement a new system for new hires. Presently, the company hires new employees based on fragmented process that lacks coherency and structure. She is requesting something more advanced based on probability and decision$-$making.

You suggest a concept in probability called the Combinations rule to motivate a re$-$structuring. It is useful for selecting the number of ways r objects can be selected from n objects without regard to the order of selection. The expression is as follows: nCr $=$