One of the most astonishing facts in mathematics and probability is the sheer scale of 52 factorial (52!), the number of ways to shuffle a standard deck of playing cards. That number is so massive ...

We have 52 different cards in a deck, so that would be 1x2x3x4x5x6x7x9.....and you keep going until you hit 52. We call it 52 or 52 factorial! Ray Petelin ...