More on the Monty Hall problem

The Daily Mail maths article I have just blogged about also gives the Monty Hall problem.

I blogged about this problem last month: my attempt to see if it worked in practice had been a dismal failure. If so first you don't succeed, try, try again, so a couple of weeks ago I repeated it as an icebreaker before a talk I gave to my Liverpool colleagues. That trial was a success:

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