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LESSON 4 · Math Hacks for Decisions

PAUSE TO THINK

How many people with PhDs wrote in to insist the Monty Hall answer was wrong?

Nearly 1,000 of them

When Marilyn vos Savant published the switch-and-win answer in 1990, she was buried in protest mail. Of roughly 10,000 letters, close to a thousand came from PhD holders, some calling her logic absurd. She had it exactly right.

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