## Thinking Mathematically (6th Edition)

The number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur. ---------- 1. The gender of the customer can be chosen in 2 ways. 2. The age group of the customer can be chosen in 2 ways. 3. The type of payment can be chosen in 2 ways. Applying the Principle, the total number of shopper categories is 2$\times$2$\times$2$=8$