### Home > A2C > Chapter 10 > Lesson 10.2.6 > Problem 10-154

10-154.

Find how many types of pizzas with three toppings can be made.

_{8}*C*_{3}

Find how many pizzas with four toppings can be made.

_{8}*C*_{4}

_{8}*C*_{3} + _{8}*C*_{4} = 56 + 70 = 126

If mushrooms are a known topping, then you choose one fewer topping from only 7 remaining toppings.