Final Exam Study Guide Problem 3 Solution

The third problem on the Final Exam Study Guide comes from Section 8.1. In this problem you are asked to count arrangements of people where different orderings of the same people are different and you are not allowed to repeat choices. This makes it different from Problem 2 on the Final Exam Study Guide where order makes a difference but repetition is allowed.

To count this type of arrangement you need permutations:

final_study_guide_soln_10

where n is the number of objects you are choosing from and r is the number selected.

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