How do we know that the number of arrangements in which she can visit the cities is 4! Is it - Maths - Probability

Question

How do we know that the number of arrangements in which she can
visit the cities is 4! Is it because there are 4 cities ? Plz
explain If there would just be 3 cities then it would be 3! ?

Saksham Rai · Accepted Answer

How do we know that the number of arrangements in which she can visit the cities is 4! Is it because there are 4 cities ? Plz explain . If there would just be 3 cities then it would be 3! ?