Question 38038: How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be on an end?
Answer by fractalier(6550)   (Show Source):
You can put this solution on YOUR website! Since the first book MUST be a dictionary,
you have five choices for the second book, four for the third book, three for the fourth book, two for the fifth book, and one left for the last...thus the number is
1 * 5 * 4 * 3 * 2 * 1 = 120 ways
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