A night watchman visits 9 offices every night. To prevent others from knowing when he will be at a particular office, he varies the order of his visits. In how many ways can this be done?

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The Answer of A night watchman visits 9 offices every night. To prevent others from knowing when he will be at a particular office, he varies the order of his visits. In how many ways can this be done?

A Night Watchman Visits 9 Offices Every Night