Example 3 A Science Club has 20 members. They wish to elect officers consisting of a president, a vice president, a secretary, and a treasurer. How many sets of officers are possible? Given: $n = 20$ $r = 4$
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- For the president position, there are 20 members to choose from. - For the vice president position, there are 19 members left to choose from (since one member has already been chosen as president). - For the secretary position, there are 18 members left to Show more…
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