A slight varient. I've been reading a rather good book about cognitive illusions and their use in society. Cognitive illusion being like an optical illusions but its the brain which gets it wrong.
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I've no doubt you unwholesomely clever bunch will get them straight away but i thought they were quite clever.
1.
I have three boxes. With your back turned i put £20 in one of them.
I offer you a free choice of boxes. You choose one leaving me with two.
I discard one of my boxes which i know to be empty so now i have a box and you have a box. One of us has the box containing £20, i know which one but you don't.
I offer you the oppertunity to swap boxes with me or to stick with your present choice.
Should you A: swap or B: stick or C: does it make no difference.
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