Magic

Here’s a statistical card trick. As I try to explain in the video, admittedly not very clearly, the rules of the trick are as follows:

  1. Matteo picks a card at random from the pack. This card is unknown to me.
  2. I shuffle the cards and turn them over one at a time.
  3. As I turn the cards over, Matteo counts them in his head until he reaches that number in the sequence. As you’ll see, his card was a 5, so he counts the cards until he reaches the 5th one.
  4. He then repeats that process, starting with the value of the 5th card, which happened to be a 10. So, he counts – again silently – a further 10 cards. He remembers the value of that card, and counts again that many cards.
  5. And so on until we run out of cards.
  6. (Picture cards count as 10.)
  7. Matteo has to remember the last card in his sequence before all of the cards ran out.
  8. And I – the magician – have to predict what that card was.

Now take a look at the video….

How did I do it? And what’s it got to do with Statistics? I’ll explain in a future post, but as usual if you’d like to write to me with your ideas I’ll be very happy to hear from you.

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