In presentations/workshops I now find vanilla-flavoured Monty Hall to be of no real value - nearly everyone says
"SWITCH!!" without thinking. So I offer this variant.
I have 10 cups, and under one is a prize. I get a victim - ahem - volunteer to select two, and place markers on them.
I then say clearly that I will remove 6 of the other cups and, to retain the mystery, will not reveal the prize. There are now four cups, the prize is under one, and two of them are the volunteer's original choice.
And now the offer: They may retain their original two, or they may surrender their two and select only one of the other, currently unselected two.
So:
* What would you do, and why?
* What interesting further variant can you think of?
I have 10 cups, and under one is a prize. I get a victim - ahem - volunteer to select two, and place markers on them.
I then say clearly that I will remove 6 of the other cups and, to retain the mystery, will not reveal the prize. There are now four cups, the prize is under one, and two of them are the volunteer's original choice.
And now the offer: They may retain their original two, or they may surrender their two and select only one of the other, currently unselected two.
So:
* What would you do, and why?
* What interesting further variant can you think of?