Let's make a deal.

Contestant is looking at 3 doors and gets to choose one of the three and gets to keep the prize behind it... Two of the doors conceal a goat, and only one door conceals a 2007 Mercedes Benz... Contestant picks door number 1... Before the contestant opens the door, the emcee, Monte Hall opens one of the other 2 doors that does NOT have a the car behind it, leaving only the contestant's chosen door and one other... At this point, before the contestant is allowed to open his door, Monte now offers the contestant a choice... He can keep the door he originally chose, or he can now have the other door that is left... The one Monte Hall didn't open... The question is: Which door should the contestant choose?