In how many ways 7 persons can be seated in a row?
720
5040
710
5020
Given that,
7 persons may sit in 7 seats.
1st person may sit on any one of the 7 seats
2nd person may sit on any one of the 6 seats
3rd person may sit on any one of the 5 seats
4th person may sit in any one of the 4 seats and so on.
Therefore, the total number of ways is
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