In a standard deck of 52 cards, there are four suits (clubs, hearts, diamonds and spades) and 13 cards of each suit. what is the probability of randomly selecting two cards, which turn out to be the same suit
The first card can be any card: 52/52
The next card can be any of the twelve cards that are of the same suit as the first card: 12/51
Probability = 52/52 x 12/51 = 4/17