Remember the old 'Let's make a deal show'? Here is the scenario: - You have 3 doors to choose from. You pick one door. - One is a winner, the other 2 are losers. You choose a door and one of the other 2 doors is revealed to show its a loser. Question: Now that you have seen one of the other 2 doors has been revealed to show it was a loser, would you now switch your original choose of a door to the other remaining unopened door and WHY?

No rational basis for either holding what you have or switching. Odds of ending up with the winner are 50:50, regardless.