Final answer:
There are 24 different seating arrangements the boys can choose from.
Step-by-step explanation:
To determine the number of different seating arrangements, we need to consider the number of ways Bobby's friends can be seated in the available seats. Bobby has 4 tickets, so there are 4 choices for the first friend, 3 choices for the second friend, 2 choices for the third friend, and 1 choice for the fourth friend.
Therefore, the total number of seating arrangements is 4 x 3 x 2 x 1 = 24.