Unusual, funny, famous and intriguing probability puzzle:
Suppose you're on a game show, and you're given the choice of 3 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? 
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