You know how many cards there are in a deck?

People can shuffle them into a random order and then memorise the order, so it's really not that many cards.

Each time you shuffle the deck it's the same familiar cards, we can easily recognise and differentiate every card in the deck.

But how many different ways are there to arrange that deck of cards? How many possible combinations?

More than there are stars in the sky. Every shuffle is unique.

I love my job because I get to use familiar ideas to help people make sense of their own unique shuffle 😊