## Thinking Mathematically (6th Edition)

$243$
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 1st question can be chosen in 3 ways. 2. The 2nd question can be chosen in 3 ways. 3. The 3rd question can be chosen in 3 ways. 4. The 4th question can be chosen in 3 ways. 5. The 5th question can be chosen in 3 ways. Applying the Principle, the total number of different orders is 3$\times$3$\times$3$\times$3$\times$3=$243$