There are 5 customers currently present in a coffee shop. Three of the customers are waiting in line at the front register. How many different lines of customers are possible?

Choose and arrange 3 of the 5 customers in line. There are 5 choices for the first position, 4 remaining choices for the second, and 3 for the third, so 5 × 4 × 3 = 60 different lines. The correct choice is C, 60.

AI-written and checked against the verified answer.