test have the possibility of a inconclusive result in probability 0.08, a positive result in probability 0.02 and a negative result in probability 0.9. 4 tests are performed. a- What is the probability that two tests will come out negative and one will end with an inconclusive result. b- What is the probability that three tests will be positive and at most one test will end up with an inconclusive result. c- Given that 3 tests were positive, what is the probability that there we don't have any tests defined as "inconclusive".