You may have found the correct probability for flipping tails and rolling less than 3 separately, and then added these fractions together. Rather, you should use the Fundamental Counting Principle to find the size of the sample space, or write out every possible outcome. There are two possible outcomes in the event space: {T1, T2}. Divide the size of the event space by the size of the sample space to find the probability. The correct answer is