The Woman Who Told PhDs to Switch — and They Hated It
How Marilyn vos Savant outsmarted the math experts — and a few goats — with a single column.
Sometimes the smartest move isn’t obvious. Sometimes it’s better to switch.
The Woman Who Told PhDs to Switch — and They Hated It
How Marilyn vos Savant outsmarted the math experts — and a few goats — with a single column.
Photo by BAILEY MAHON on Unsplash
In 1990, Marilyn vos Savant, officially the woman with the world’s highest IQ at 228, received a seemingly simple question for her Parade magazine column:
“You’re on a game show. Three doors. One car, two goats. You pick a door. Monty Hall opens another, revealing a goat. Do you stick or switch?”
Most readers — and yes, most mathematicians — said: “It doesn’t matter. Two doors left, 50/50.”
Marilyn said: switch.
And then… chaos.
Thousands of letters poured in. Angry letters. PhDs insisting she was wrong. Letters calling her a fraud. Letters that practically screamed: How dare a woman tell us the math?!
Marilyn didn’t flinch. She calmly explained: sticking gives a 1/3 chance of winning. Switching gives 2/3. Counterintuitive, yes — but true.
Simulations later proved it beyond doubt. The car isn’t behind your first pick most of the time. The experts? Mortified.
Marilyn had done what seemed impossible: she’d bested the academic establishment in plain sight, armed only with clarity and confidence.
The Monty Hall problem now appears in every probability course and puzzle collection. But the story behind it? That’s the part worth remembering.
Sometimes the smartest move isn’t obvious. Sometimes, it pays to switch.
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