how do i do combinations for probability?

label Mathematics
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Billy is picking a sandwich, a snack, a dessert, and a dink for his lunch. He can have a ham, turkey, or salami sandwich; an apple, banana, or carrots for his snack; a cookie or brownie for his dessert; and apple or orange juice for his drink.

How many combinations does Billy have to choose from?

May 16th, 2015

This is a counting problem.

There are 3 choices of sandwiches,  3 choices of snacks, 2 choices of dessert, and 2 choices of drinks.

This means there are 3x3x2x2 = 36 possible combinations.

May 16th, 2015

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May 16th, 2015
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