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 on an end?

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Question 391380: 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 sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

Here 6 books, one is dictionary

no. of ways to arrange 5 books (except dictionary) = 5P5 =5! = 120

no. of ways to arrange dictionary = 2 ( first or last place)

total no. of ways to arrange 6 books = 2 * 120 = 240