The Monty Hall problem is a brain teaser, originated from the American television game show Let’s Make a Deal and named after its original host, Monty Hall. It is basically a probability puzzle, originally posed (and solved) in a letter by Steve Selvin to the American Statistician in 1975. It became famous as a question from reader Craig F. Whitaker’s letter quoted in Marilyn vos Savant’s “Ask Marilyn” column in Parade magazine in 1990.