Answer to Question #272240 in Statistics and Probability for oop

Question

A room has 3 doors. In how many ways can an individual make a trip into this room and out again if he must enter and leave only by means of the doors? show your solution and explain

Answer 1

The ways of entering the room is 3.

The ways of exiting the room is 3.

Thus, an individual can make a trip into and out this room in 3*3=9 ways.