Ed Cobb sent the following letter

Your answer to the "Behind Which Door" puzzler left me even more confused than before, so I did a little figuring and came up with this explanation which I believe should lay the whole thing to rest:

• If your original guess was correct and you switch, you lose.
• If your original guess was wrong and you switch, you win.
• Since your original guess would be wrong two out of three times, if you switch you'll win two out of three times.

Simple, huh?

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