What is the chance of two cards with the same rank being next to each other if you draw
n cards from a 52-card deck?
(Hint: the chance becomes >50% when
n is 13)
Three cards in a row?
(Hint: the chance becomes >10% when
n is 47)
(Hint: if you go through four shuffled decks, one at a time, looking for four in a row, the chance is <1%. With 5 decks, the chance is >1%)