Robin has 10 books. Thère is enough space on a shelf for 4 books. In how many ways can 4 of the 10 books bearranged on the shelf
1 answer:
If the 10 books are all different, we have:
• 10 ways of selecting the first book,
,• 9 ways of selecting the second book,
,• 8 ways of selecting the third book,
,• 7 ways of selecting the fourth book.
The total number of ways to arrange 4 of the 10 books is:
Answer
There are 5040 ways of arranging the books.
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