## 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. --------- Ways of choosing the 1st letter: 2 (either a W or a K) 2nd letter: 26 3rd letter: 26 4th letter: 26 Total: 2$\times$26$\times$26$\times$26=35,152