A standard deck of 52 cards contains, inter alia, four Queens.
After a perfect shuffle, one turns cards from the top one after another, until the first Queen appears.

Please provide your justified estimate at what step will the 1st Queen appear.

I took perfect shuffle to mean that the cards are totally randomized after the shuffle. I make no assumptions about the sequence of cards before the perfect shuffle.

Posted by Steve Herman on 2024-01-30 09:45:30