Final answer:
The Director has 18 different choices for selecting two trombone players and one saxophone player.
Step-by-step explanation:
The Director has 3 choices for the first trombone player out of the 3 available trombone players.
After selecting the first trombone player, the Director has 2 choices for the second trombone player out of the remaining 2 available trombone players.
Similarly, the Director has 3 choices for the saxophone player out of the 3 available saxophone players.
Therefore, the total number of different choices the Director has is calculated by multiplying the number of choices for each position: 3 choices for the first trombone player x 2 choices for the second trombone player x 3 choices for the saxophone player = 18 different choices.