- A7
- B6
- C8
- D10
Step-by-Step Solution
n distinct objects in a row give n! arrangements, so n! = 5040. Since 7! = 5040 (and 6! = 720, 8! = 40320), n = 7.
Answer: A) 7
The number of permutations of n distinct books placed in a row on a shelf is 5040. Find n.
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