You and 4 friends go to a concert. In how many ways can you sit in the assigned seats
There are 5 people in total, so there are 5 ways to choose who sits in the first seat. Once that person is chosen, there are 4 ways to choose who sits in the second seat, then 3 ways to choose who sits in the third seat, then 2 ways to choose who sits in the fourth seat. Finally, there is only 1 person left to sit in the last seat.
Multiplying these numbers together gives:
5 * 4 * 3 * 2 * 1 = 120
So there are 120 ways for you and your 4 friends to sit in the assigned seats at the concert.