The numbers 1, 2, 3, 4, and 5 are written on slips of paper, and 2 slips are drawn at random one at a time without replacement. Find the given probabilities. a. The sum of the numbers is 8. b. The sum of the number is 4 or less. c. The first number is 2 or the sum is 6. . . . a. The probability that the sum of the numbers is 8 is (Type an integer or a simplified fraction.)