Many retail stores open their doors early the day after Thanksgiving to attract shoppers to special bargains. A shopper wanting two medium blouses heads for the sale rack, which is a mess, with sizes jumbled together. Hanging on the rack are 4 medium, 10 large, and 6 extra-large blouses. Find the probability of each event described.
(a) The first two blouses she grabs are the wrong size.
(b) The first medium blouse she finds is the third one she checks.
(c) The first four blouses she picks are all extra-large.
(d) At least one of the first four blouses she checks is a medium.