Some permutation problems involve more than one case. When more than one case is involved, you must calculate the number of permutations in each case and add those numbers together. Here is an example involving cases.
Read “Example 5: Using Cases to Determine Permutations” on page 523 of the textbook. Notice that you add the number of permutations for each case.
View Permutations by the Case to see a full explanation of Example 5.
With a partner or in a group, discuss how the answer to Self-Check 3 would change if the passengers could use both buses and the 6 people could choose either bus.
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