1. A cell phone requires the user to have a 4-digit numeric PIN to unlock the phone. Suppose the 4-digit PIN can be any number from 0000 to 9999. Each phone comes with a preset PIN that the user can change. The preset PIN is randomly selected for each phone. (5 points each) How many possible PINS are there? b. What is the probability that the randomly selected PIN has no repeated digits? c. What is the probability that the randomly selected PIN contains the digits 1, 2, 3, 4 in any order?| d. What is the probability that the randomly selected PIN contains only 55? 9