2. Give the rest of the deck to a spectator and ask him to shuffle it. As he is shuffling, ask him to think of any number between ten and twenty, saying, "The number that you decide upon will, in turn, decide the fate of this experiment." You turn your back at this point.

Tell him to deal that number of cards from the top of the deck, one by one, into a face-down pile on the table. Continue, saying, "There will be two digits in your number, so I want you to make a calculation known as a random number reduction. Simply add the two digits together to arrive at a smaller number." Instruct him to now take back that number of cards, one by one, from the dealt pile and place them back on top of the deck. Tell him to look at and remember the card that now lies on top of the deck. He then concludes this stage by picking up the remainder of the cards on the table and by placing them on top of the deck, thus burying his card. Point out to the spectator that this is the only card that he need remember from here onward.

3. Draw attention to the six pairs of cards lying on the table. Invite the spectator to point to any one of the pairs. At this point in the explanation, we will presume that he indicates any pair except the Threesome. We will deal with that option in a moment. Turn the selected pair face up (figure 2).

You now gather up the other five sets of cards by picking up the Threesome first, holding it in a Biddle grip (figure 3). Place this packet squarely on top of any one of the pairs (figure 4), then lift the combined packet. Gather the remaining three pairs below the packet in this manner. Finally, drop the reassembled packet on top of the deck. Draw attention to the selected pair and ask the spectator to add together the two values. He will, of course, arrive at eleven.

If the spectator points to the Threesome, slide it toward yourself then pick it up, saying, "That's eliminated. Now point to another. We want all but one pair eliminated." As each pair is eliminated, you pick it up beneath the Threesome as explained above. Finally, drop the combined packet on top of the deck, then turn over the pair remaining on the table. Openly add their values together to give you the number eleven.

4. As an apparent afterthought, say, "Of course you could have selected any other pair." At this, lift off the top two cards and turn them face up, saying, "As you can see, these total twenty, the next pair would have given Fifteen (or whatever)." You continue lifting off pairs and showing them to total anything but eleven. Leave these ten cards lying on the table.


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