A pizza restaurant uses 7 different toppings on its pizzas. At lunch time it has a pizza buffet and makes pizzas with 2 toppings. If it wants to serve every possible combination of 2 toppings, it would need to make 14 different pizzas.

Question

Quizplus · Accepted Answer

The number of different pizzas with 2 toppings that can be made from 7 toppings is calculated using combinations, specifically 7 choose 2, which equals 21, not 14.

A Pizza Restaurant Uses 7 Different Toppings on Its Pizzas