Carding Correctly
10/22/2021 |
The Friday File: To randomize a deck of 52 cards it is necessary to riffle shuffle the deck manually seven times. With a perfect riffle shuffle, when one card drops from each side, eight shuffles are necessary. It turns out, by naturally varying the number of cards that drop from each side, randomness is achieved slightly more quickly. Casinos shuffle one deck for 18 seconds, two decks for 45.