b) An urn contains 6 blue balls and 4 red balls. A second um contains 4 blue balls and an unknown number of red balls. A single ball is drawn from each urn. The probability that at least one blue ball is drawn is 0.68. Find the number of red balls in the second um. (4 marks) c) Among a large group of long Covid patients, the health Director General reported that 22% visit both a public hospital and a private hospital to receive treatment and rehabilitation, whereas 12% visit neither of these. The probability that a patient visits a public hospital exceeds by 0.14 the probability that a patient visits a private hospital. If there is a total of 5,200 long Covid patients, calculate the number of patients that visit a private hospital. (4 marks)