Two cards are drawn at random from a deck. What is the probability that the card is number 4 or a King?
Explanation
There are four number 4 in a deck so its probability = 4/52 = 1/13. Similarly there are four Kings in a deck, so 4/52 = 1/13. The probability that the card is number 4 or King = 1/13 + 1/13 = 2/13