Steve Selvin

You're on "Let's Make a Deal", and Monty Hall shows you three doors. (Monty Hall is dead, but it'll be a cold day in hell before we defer to Wayne Brady!) Behind two of the doors is a goat, behind the third one is a car. You pick... it doesn't matter, say Door #1.

Monty then opens Door #2 to reveal a goat and offers you a chance to switch to Door #3. What do you do?

SWITCH. YOU ALWAYS SWITCH!

But... No buts! Switch!

We're not going to get to the mathematics of this. They are pretty simple, but confounded many since the Monty Hall Problem was posed by statistician Steve Selvin back in 1975. But if you don't believe us (or Selvin), here is our own Monty Hall simulator. You can play it yourself, or have the computer play 100 completely random games at a time.

Convinced yet?

1

2

3

One of the doors has a car, the other two have goats. Please pick a door!

The host opens door #X to reveal a goat. Would you like to keep door #Y or switch to door #Z?

You were XXXX! The car was behind door #Q!

STAY 0 wins 0 losses

SWITCH 0 wins 0 losses

pics = new Array(document.getElementById("pic1"), document.getElementById("pic2"), document.getElementById("pic3")); cells = new Array(document.getElementById("cell1"), document.getElementById("cell2"), document.getElementById("cell3")); spans = new Array(document.getElementById("c1"), document.getElementById("c2"), document.getElementById("c3"), document.getElementById("c4"), document.getElementById("c5")); tds = new Array(document.getElementById("td1"), document.getElementById("td2"), document.getElementById("td3")); ws = new Array(document.getElementById("w1"), document.getElementById("w2"), document.getElementById("w3"), document.getElementById("w4")); arr = new Array(0, 1, 2); revealed = new Array(false, false, false); stage = 0; car = -1; guess = -1; switchGuess = -1; win = new Array(0, 0); lose = new Array(0, 0); bot = false; restart(); function restart() { for (i = 0; i