From a full deck of 52 playing cards, how many cards do you need to draw to ensure that you have four of a kind in your hand?
If you have not tried to solve the puzzle, have a go now. For everyone else the answer is after the break.
Imagine randomly removing 39 cards from a deck. Amazingly, you remove all of the spades, diamonds and hearts. You would not have any four of a kind. However, the moment your remove an additional card you would have a four of a kind. And that’s the answer – 40 cards. Did you solve it?
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.