A mathematical poker magic, I remember taking out eight cards to remind the audience of a card, and then the magician picked up a few cards and asked if there were any.

The numbers of the eight cards are: 0, 1, 2, 3, 4, 5, 6, 7.

I found it for the first time 1, 3, 5, 7, and asked if it was in it. If so,+1 is not +0.

Pick up 2, 3, 6 and 7 for the second time and ask if they are among them. There is +2, and there is no +0.

Pick up 4, 5, 6 and 7 for the third time and ask if they are among them. There is +4, but there is no +0.

The last number is the number of the card that the audience thinks of.

-The essence is.

Eight cards are numbered with binary numbers: 000,00 1, 0 10, 01,100,10.

I found 0065438+0,011,1kloc-0/,11for the first time, and asked if it was in it. If so,+1 is not +0.

The second time, 065438 +00, 0 1 111asks if it is inside, if it is+10 instead of +0.

Answer 65438 +000, 10 1,10,11for the third time and ask if it is in it. If it is+1.

The last number is the binary number of the card that the audience thinks of.