Question

A pair of dice is rolled. What is the probability that the sum of the two dice will less than 4 given that the first die rolled is a 2?

Answer 1

If the first one is a two, the other dice must show a 1 for the sum to be less than 4. The probability of the second dice showing a 1 is 1/6. We don’t care about the first dice because it’s given it’s a 2.