A fair number cube is rolled. What is the probability that a number less than 4 is rolled?

A. 1/3

B. 1/2

C. 2/3

D. 1/4

Answer: B) 1/2

There are six sides labeled 1,2,3,4,5,6. We want values that are less than 4, so we want values from the set {1,2,3} which represents half of the list. In other words, we have 3 ways of getting what we want (1 or 2 or 3) out of 6 ways total (1,2,3,4,5,6) to have 3/6 = 1/2