5 friends are having their picture taken. How many ways can the photographer arrange them in a row?

Answer 1

There are 5 people that can be placed in the first position, 4 remaining people that can be placed in the second position, 3 remaining people that can be placed in the third position, 2 remaining people that can be placed in the fourth position, and only 1 remaining person left to be placed in the fifth position. Therefore, the number of ways the photographer can arrange the 5 friends in a row is:
5 x 4 x 3 x 2 x 1 = 120 ways.