SOLUTION: Find the number of ways in which nine books can be arranged in a shelf if four particular books are to be kept together.

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Question 634811: Find the number of ways in which nine books can be arranged in a shelf if four particular books are to be kept together.
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

ways in which nine books can be arranged in a shelf if four particular books are to be kept together.

 4 books as one Unit 4%2A3%2A2%2A1 or 24 ways they can sit together on the shelf

ALL nine:  24%2A6%21= 17,280 ways