There is a 3/8 chance of showing at least on four.
To find this probability, we must first add together the chance of rolling a four on either die.
1/6 + 1/4 = 5/12
Then, we must subtract away the probability of getting a 4 on both die, because we don't want to count that twice only once.
5/12 - 1/24 = 3/8
