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Combinations

CONCEPTS

Equation

• Number of combinations = Number of Event A * Number of Event B * Number of Event C etc


Tips

• The word, combination, is typically in the question


Definitions

• Combinations: The number of possible arrangements where order doesn’t matter

PRACTICE PROBLEMS

Question 1 Given 5 shirts, 8 pants, 3 socks, How many combinations are there?


-- Answer -- 120

5 shirts * 8 pants * 3 socks = 120



Question 2 A reservation number is composed of 5 digits. The digits can be any number from 0 - 9. The digits may repeat. How many possible 5 digit reservations numbers are there?


-- Answer -- 10 * 10 * 10 * 10 * 10

ACT PRACTICE PROBLEMS

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