An office block has five floors (ground, 1st, 2nd, 3rd and 4th), that are all connected by a lift. When the lift goes up and reaches any floor (except the 4th), the probability that it continues to go...

An office block has five floors (ground, 1st, 2nd, 3rd and 4th), that are all connected by a lift. When the lift goes up and reaches any floor (except the 4th), the probability that it continues to go up after it has stopped is __ 3 4 When it goes down and reaches any floor (except the ground floor), the probability that it continues to go down after it has stopped is __ 1 4 The lift stops at any floor that it passes. The lift has gone down and is now at the first floor. Calculate the probability of these events. a Its second stop is the third floor. b Its third stop is the fourth floor. c Its fourth stop is the first floor.