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What does it mean to shuffle a deck? Here are some of the slides I made for my @MathforAmerica talk at #MfAThursdayThinks last night. We did a simple example with a 3 card deck. (Thread) 
A state specifies what I know about the ordering (configuration) of a deck. (If you wish: a probability distribution on configurations of a deck.) 2/
A shuffle will move a deck from state to state. We did an example with a random-to-top shuffle, which picks a card at random (with equal probability) and moves it to the top of a deck. 3/
