Question

people are entering a room with five doors and come out, how many ways are there if they can’t go out from the door they went in.

Answer 1

how do you find the area of a square

Answer 2

If a person comes in one of the five doors and can only leave from another door, that means there are four ways that person can leave.

Answer 3

First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

Multiply the height times width. With a square, the sides are equal, so area = s^2 (side squared).