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Thanks very much Inferrd, that was exactly the problem. I replaced Math.Round(Rnd() * 2) with Int(Rnd() * 3) and it worked great. I do understand where I went wrong now - half of the real numbers...

I'm writing a quick a simulation for The Monty Hall Problem but it comes up with winning a car 75% of the time, even with 20k simulations. It does that every time, but I can't understand why. It...