## Inadequate card shuffling?

Does it really matter how many times you riffle shuffle (as illustrated) your cards before you play a hand in any card game? Well…I caught a blurb out of Amir Aczel’s book, Chance where he stated that:

“six or seven riffle shuffles are sufficient to produce a well-shuffled deck. …fewer than five shuffles is notably insufficient”

Apparently mathematicians have determined that to actually randomize a deck of cards the above must occur. So, I guess that (when playing poker) might explain the high occurances of pairs and trips if a deck is not properly shuffled. This leads to my question… **When in play, is it a true fair game if the cards are not shuffled at least six times?**

Anyway not sure if this information is valuable, but it is good to know.

JustinJust so you know, it was magician/mathematician Persi Diaconis that came to this conclusion.

September 23, 2010 at 9:41 pm

bigmalikThanks for identifying that mathematician. We must give credit where it is due. Thanks again!

November 14, 2010 at 11:19 pm