Chapter 11 - Counting Methods and Probability Theory - 11.1 The Fundamental Counting Principle - Exercise Set 11.1 - Page 692: 3

12

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 color can be chosen in $3$ ways. 2. The tips can be chosen in $4$ ways. Applying the Principle, the total number of choices is $3\times 4=12$