Two tetrahedral dice are rolled (see Exercise 5).

a. What is the probability that the sum on the upward faces is 4?

b. What is the probability that the sum on the upward faces is 6?

Exercise 5

A tetrahedral die Is one with four triangular sides. The sides show the numbers from 1 to 4. Say two tetrahedral dice are rolled. List all of the possible outcomes of the experiment as a sample space.

1 Tetrahedral die