What is the probability that if you draw a card from a standard deck of cards that it is a card of Diamonds or an 8 ?

Answer 1

prob(diamonds) = 1/4
prob(an 8) = 4/52 = 1/13
prob(the 8 of diamonds) = 1/52
prob(an 8 or a diamond) = 1/4 + 1/13 + 1/52
= 13/52 + 4/52 - 1/52 = 15/52 = 4/13

Answer 2

4/52