Over the weekend I will be giving a couple of talks at the Cheltenham Science Festival. Do come along and say hello. So, to the puzzle….
A blind man is given a deck of 52 playing cards. All of the cards are face down and the man is told that this is the case. Ten of the cards are then randomly chosen and turned face up. How can the man divide the cards into two piles and ensure that that each pile has the same number of cards facing up?
As ever, please do NOT post your answers, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.