MATT: OK, so I'm going to do a card trick based on the number 27. And this is my all-time favorite maths card trick. And I'm going to show it for you today, and I'm going to explain it. I found this trick in an old 1950's math book written by Martin Gardner. And for me it is the maths card trick with the most beautiful maths behind it out of all of them.
And because it is a math card trick, it does involve a lot of long tedious counting. But bear with us here. So this involves 27 cards, so I'm going to take 27 off. And this is a genuine count. One, two, three, four, five, six, seven, eight, nine, 10. 27 is actually one of my favorite numbers-- One, two, three, four, five, six, seven, eight, nine, 10-- because it's a cubed number. One, two, three, four, five, six, seven. OK, that's 27 cards. And this works with any 27 cards, and none of this trick is slight-of-hand. None of it is YouTube magic where I'm using something sneaky, or a sneaky edit. And I'll explain the trick afterwards, so it's OK. But this is how works-- You get 27 cards, you shuffle them up Oncasinogames Canada. I'm actually going to get Brady to both film and be the volunteer. So I'll flick through, do you want to tap which one you want, which one of these? OK that one there. Do you want to show you the camera that card? Don't let me see it, obviously. And do you want to put it back in wherever you want? Thank you. Now all he needs to do is just remember what that card was, and believe me, people in the comments will mention afterwards if you don't. Brady what's your favorite number from 1 to 27, if you had to pick a number? BRADY: 10. MATT: 10, any particular reason why 10? BRADY: I just like how it looks. MATT: You like it? OK. Are you looking for your card by the way? What I want you to do is have a look, and see if you can spot which pile your card goes into. And people may have seen this trick done before. It's a variation, in fact, it's a generalization on a 21 card trick. Which pile is it in? BRADY: It's in that pile. MATT: In the middle pile there? OK, I'm going to pick them up from the viewer's right to left. And what people tend to do is they do this tedious counting out each time. And what I'm actually doing is last time I memorized all the cards. And so I when you told me which pile, I had narrowed it down to nine possible cards it could be. If I do it again, because of the way I'm dealing it out, if you tell me which pile it's in this time, I will narrow it down to one of three possible cards. Which pile is it in this time? BRADY: This time it is in the middle pile. MATT: The middle one again, there we are. OK purely coincidence, I'll pick them up again. And then we'll do it one last time again dividing by 3, and this is why 27 is 3 cubed. If you say which one it's in I will know, having memorized all the cards, exactly one in one, or I will know precisely which card it is. And that's just the pure information of this trick. Which one's it in? BRADY: That one. MATT: That one over there. Cool, OK. So now to be fair all of that wasn't true. Well the numbers were true, and the number of cards it could've been going from 27 to nine, to three, to one, that is completely accurate. I wasn't bothering to memorize them though, I was doing something else slightly different. What was your card? You can tell me now. BRADY: It was the king of hearts. MATT: King of hearts, and what was your favorite number? BRADY: 10. MATT: OK. Watch this. Here we go. Ready? One, two, three, four, five, six, seven, eight, nine, 10. King of hearts. So this trick, you can put the card-- even though you don't know what it is-- as long as they tell you which pile it's in, you can put it anywhere in that deck. So if you say any number, after three lots of dealing it out, I can put the card into that position. And that is my all-time favorite maths based card trick. Do you want to know how it works?
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