A card is drawn at random in an ordinary pack of 52 playing cards. What's the probability that the card is a club or a diamond?

Answer 1

Let A = Club and B = Diamond, here we want P(A or B) = P(A) + P(B) - P(A and B). Now we just need to figure out P(A), P(B) and P(A and B). The only tricky part is that what is the chance you will get a card which is Club and Diamond at the same time?