The Infamous Monty Hall Problem

The Setup

• you are presented with 3 doors (A, B, C) only one of which has something valuable to you behind it (the others are bogus)
• you do not know what is behind any of the doors

You choose a door

Monty then counters by

• showing you what is behind one of the other doors (which is a bogus prize), and
• asks you if you would like to stick with the door you have, or
• switch to the other unknown door

The question is

Should you switch?

Another question is

Does it matter?

The answer lies behind this link

Don't look until you've decided upon your answer.