Total number of cards in a deck = 52 Total number of diamond cards =13
Possible favourable outcomes: 1. The first card is a diamond but the second card is not. 2. The first card is not a diamond but the second card is. 3. Both the first and second cards are diamonds.
P(at least one diamond card) = (13/52) (39/51) + (39/52) (13/51) + (13/52) (12/51) = 15/34
