Monty Hall Probability

Kevin FOO
Nov 17, 2021

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I was intrigued by this probability trick, tricking you into thinking that your choice of changing or not changing the door you pick does not affect your winning probability of 1/3. Actually… changing your door choice gives you 2/3 probability of winning instead of 1/3.

I wrote a simple Ruby program of 100,000 participants playing the game to prove the theory.

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Kevin FOO
Kevin FOO

Written by Kevin FOO

A software engineer, a rock climbing, inline skating enthusiast, a husband, a father.

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