申論題

5.Suppose that there are five identical bowls, which are labeled 1, 2, 3, 4 and 5. Bowl t contains t red and 5-1 blue balls, with t= 1, 2, 3, 4 and 5. A bowl is randomly chosen and two balls are randomly selected without replacement from the contents of the bowl.

(1) Find the probability that the two balls selected are both red? (10%)