A tree diagram with 8 possible outcomes. The outcomes are (H, H, H), (H, H, T), (H, T, H), (H, T, T), (T, H, H), (T, H, T), (T, T, H), (T, T, T). What is the probability of getting 2 heads up and 1 tails up when flipping three coins? StartFraction 1 over 6 EndFraction One-fourth StartFraction 3 over 8 EndFraction Two-thirds