Suppose you’re on a game show

Off on an airplane and heading to the United States on the way to two conferences. No blogging for a while, and definitely not till I’m on the other side. I therefore thought I’d leave this little puzzle with you before I went.

Suppose you’re on a game show, and you’re given a choice of three doors. Behind one door is a car; behind the other doors, goats. You pick a door – say, No. 1 – and the host, who know 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?

There was an age thing when I taught this when I first got to Australia those many years ago. Happily I can still see why the right answer is the right one, but I knew already which one was right. Happy to be getting away from local politics for a while and seeing what things are like in the United States.

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