Guess what poker is?

The magician took out a deck of playing cards, washed them and put them on the performance table. Please ask a spectator to take 20 cards from the top and put them under the deck, and then take 8 cards from the top and put them horizontally on the table. Each place is based on the number of original cards (j is 1, q is 2, k is 3, king size is 4 or J Q K is 10). If it is less than 10, grab it from the original deck. Then let the audience add up the points of the three original cards. Then, the magician asked the audience to take out the added cards from the pile again. The magician can use this number to accurately guess the number of points in the last card (if the original three cards are K, Q and 6, then 3+2+6= 1 1, and the magician can tell what the eleventh card below this card is).

This trick is about shuffling cards. After the magician shuffles the cards for the last time, he only needs to remember what cards are on the cards. After performing in the above way, the last of the three original cards must be this one. This is a mathematical calculation principle.

The advantage of this set of magic lies in that, except the magician shuffles the cards, the whole set of magic is performed by the audience, which is more mysterious.