Originally Posted by **c_323_h**

Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice?

Can someone explain why the new probablilities of winning are not 1/2? I've read every article on this problem and still don't understand it! It's a paradox!