We have a mathematician in Aus name of Adam Spencer. He recently wrote a book, World of Numbers.

Here's an example,

What are the chances of a shuffled pack being the same as one that happened in the past?

The number of permutations of a pack of cards (well shuffled) is so massive that, to cover every one of them, you would need

a) a trillion trillion friends

b) each with a trillion trillion packs of cards

c) doing a unique shuffle 1000 times per second (edit) I suspect this should read 185 - see below)

d) since the Big Bang

That's how long it takes to produce all permutations (!)

Basically, you can be pretty certain that any shuffled pack has never been produced before - nor will it ever be again lol.

Here's an example,

What are the chances of a shuffled pack being the same as one that happened in the past?

The number of permutations of a pack of cards (well shuffled) is so massive that, to cover every one of them, you would need

a) a trillion trillion friends

b) each with a trillion trillion packs of cards

c) doing a unique shuffle 1000 times per second (edit) I suspect this should read 185 - see below)

d) since the Big Bang

That's how long it takes to produce all permutations (!)

Basically, you can be pretty certain that any shuffled pack has never been produced before - nor will it ever be again lol.