. This is the Monty Hall Paradox problem, stated in the lecture note 1. a) There are three empty boxes. I will put $100 in a box and close them. Now you will select a box containing money. b) First, you will select one of boxes. c) Then, I will open one box that does not contain the bill (I already know which box has the money). d) Now, there are two closed boxes, and one of them will have the money. e) You will be asked to change your mind if you want. If you have a chance to switch your selection, do you want to switch? Or keep your first selection? What is your decision? Why?