Two six-sided dice are rolled. What is the probability of rolling a total of 9?

You toss two six-sided dice. What is the probability that the total of the two dice is 5?

You draw one card at random from a standard deck of 52 playing cards. What is the probability that the card is either an ace or a spade?

Medicine Out of a group of 9 patients treated with a new drug, 4 suffered a relapse. Find the probability that 3 patients of this group, chosen at random, will remain disease-free.