3. Independent flips of a coin that lands on heads with probability 1/2 are made. What is the probability that the first four outcomes are (a) (1 pt) H, H, H, H? (b) (1 pt) T, H, H, H? (c) (3 pts) What is the probability that the pattern T, H, H, H occurs before the pattern H, H, H, H? Hint for part (c): How can the pattern H, H, H, H occur first