Card Shuffle Puzzle

World’s Simplest Magic Trick.

In just a few seconds, I will create something unique in human history using an ordinary deck of 52 playing cards. I will shuffle them seven times, and the result will be a card order so unusual that the odds of it being generated by my shuffling are one in

Again, with no training or practice, never having performed this trick before, the odds that the cards I shuffle will end up in the order I shuffle them into will be:

1 in 80,658,175,170,943,878,571,660,636,856,403,766,975,289,

Can I do it?
Would you like to bet me?

Card Fan

One Of A Kind

According to J.B. Morton on The Old Bailey blog, “The chances that anyone has ever shuffled a pack of cards in the same way twice in the history of the world are infinitesimally small, statistically speaking. The number of possible permutations of 52 cards is ‘52 factorial’ otherwise known as 52! or 52 shriek.

This is 52 times 51 times 50 . . . all the way down to one. The result of this factoring is


To give you an idea of how many that is, here is how long it would take to go through every possible permutation of cards.

If every star in our galaxy had a trillion planets, each with a trillion people living on them, and each of these people has a trillion packs of cards and somehow they manage to make unique shuffles 1,000 times per second, and they’d been doing that since the Big Bang, they’d only just now be starting to repeat shuffles.

Other Big Numbers

How big is this number?

Someone shuffling a deck of cards once per second since the beginning of the universe believed to be about 14 billion years ago would not have shuffled the deck more than 1018 times.

Thus it is almost certain that any given configuration achieved through random shuffling has never appeared before in the history of shuffling!

For comparison’s sake: the number of stars in the universe: 1023.

Su, Francis E., et al. “Making History by Card Shuffling.” Math Fun Facts. .