I need some help in checking my work, especially #4. Problem: You have a set of 10 cards numbered 1-10. You choose a card at random. Event A is choosing a number less than 8. Event B is choosing an even number. Draw a Venn Diagram and calculate each of the following probabilities: 1) P(A) = 77.8% 2) P(B) = 55.6% 3) P(A intersection B) = 33% 4) P(A union B) = 100% 5) P(A complement) = 22.2% For #4, my calculations were P(A union B) = P(A) + P(B) - P(A and B). Did I calculate something wrong here?