A set of story book has six volumes. In how many ways can the six volumes be replaced on the shelf?
2017-09-26 9:00 pm
A set of story book has six volumes. In how many ways can the six volumes be replaced on the shelf?
回答 (1)
2017-09-26 10:17 pm
✔ 最佳答案
since the six books are different, ABCSEF is different from BACDEF in arragement.therefore, there are 6P6=720 ways
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