a. 420 b. 520 c. 620 d. 720 7. In how many ways can you place 9 different books on a shelf if there is enough space for only 5 books? a. 11, 140 b. 13, 560 c. 15, 120 d. 18, 330 8. In how many ways can 5 people arrange themselves in a row for
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For example, if we have 5 books and we want to place 3 of them on the shelf, we have: 5P3 = 5! / (5-3)! = 5! / 2! = 60 So there are 60 ways to place 3 different books on the shelf. Using this formula, we can find the number of ways to place the books for each Show more…
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