1. The experiment is to select a 3 character ID. letters A, B, C Repetition is allowed. The characters you can choose from are the a. If S is the sample space for the experiment, n(S)- b. Given the following, list all elements in each set: E1 = (The 3 letters in the code are identical) E2 the first letter in the code is "A"] E3 The first and third letters in the code are identical but the second letter may or may not be.) c. Find the probability of: i. E1 ii. E2 iv. E1 U E2