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Permutations
CONCEPTS
Equation
• Number of permutations = Number of Event A * (Number of Event B – 1) * (Number of Event C – 1)
Tips
• The word, combination, is typically in the question
Definitions
• Permutations: The number of possible arrangements where order does matter
PRACTICE PROBLEMS
Question 1 A reservation number is composed of 5 digits. The digits can be any number from 0 - 9. The digits may NOT repeat. How many possible 5 digit reservations numbers are there?
-- Answer -- 10 * 9 * 8 * 7 * 6
ACT PRACTICE PROBLEMS
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