61-74 ■ Combinations These exercises involve counting combinations.
Three-Topping Pizzas A pizza parlor offers a choice of different toppings. How many three-toppings pizzas are possible?
The number of three-toppings pizzas possible.
A total of different pizza toppings are available.
The order for choosing three toppings is not considered.
The formula of the number of combinations is as follows.
Here, is the total number of objects and is the number of objects chosen.
Substitute for and for .
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