The Monty Hall Problem

“Suppose you’re on a game show, and you’re given a choice of three 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 other 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 take the switch?”

Craig. F. Whitaker
Columbia, MD

This is the infamous question that appeared in Marilyn Vos Savant’s “Ask Marilyn” column in the Parade magazine in September 1991. Ms. Savant, listed in the Guinness Book of World Records Hall of Fame for her recorded IQ of 228, answered “Yes.”

Was she Correct?

SOLUTION