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.

Answers

jane
how do you find the area of a square
PsyDAG
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.
PsyDAG
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).

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