A pizza shop has 18 different toppings to choose from. Today's special comes with a choice of 5 toppings, plus a choice of 3 types of crust: thin crust, regular, and deep dish crust. How many different combinations can be made with 5 toppings and 3 crusts?

Choose 5 toppings from 18 without regard to order: there are 18 choose 5 = 8,568 topping selections. Each selection can be paired with any of 3 crusts, so 8,568 × 3 = 25,704 combinations. The correct choice is a, 25,704.

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