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In a regular deck of 52 playing cards, the number of possible sequences of cards when shuffled is 52! (52 factorial, ie: 52×51×50×⋯3×2×152×51×50×⋯3×2×1)
That means that even though playing cards have been shuffled all day, every day, since playing cards were invented in the 1300s, there probably hasn't been the same sequence of cards in a deck reshuffled again YET.
How many possibilities of sequences are there? it’s 8×1067.
And if someone shuffled a deck of cards once per second since the beginning of the universe (about 14 billion years ago), they would have only shuffled the deck about 1018 times.
…every time you shuffle a deck of cards, chances are you're making history.