That is where you take the number of cards and multiply up. We have 52 different cards in a deck, so that would be 1x2x3x4x5x6x7x9.....and you keep going until you hit 52. According to McGill ...

A deck of cards may not seem special, and a deck really isn't special until you give it a good shuffle. That is where a deck becomes very special! Mixing up those cards can lead to something ...