SOLUTION: how many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be listed first or last?

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Question 167113This question is from textbook algebra 2
: how many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be listed first or last?This question is from textbook algebra 2

Answer by stanbon(48568) About Me  (Show Source):
You can put this solution on YOUR website!
how many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be listed first or last?
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# of ways to place the dictionary: 2
# of ways to arrange the other 5 books: 5!
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Total # of arrangements: 2*5! = 2*120 = 240 ways
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Cheers,
Stan H.