Phillip has seven shirts: light blue, navy blue, black, white, red, green, and yellow. Each day when he gets ready for work, he chooses a shirt at random. (He doesn't wear a shirt twice in a week, though.)
a. Determine the probability that in the upcoming five-day work week, he will wear white shirt on Monday, then the light blue shirt on Tuesday, then the green shirt on Wednesday, then black shirt on Thursday, then the yellow shirt on Friday?
b. Determine the probability that Phillip will wear those same five shirts, but in any order?
c. Determine the probability that he will wear the white shirt at some point during the week?