\(\frac{8}{15}\)

Find the odds against events with the given probabilities. Give your answer as a ratio of whole numbers. If neither of those two numbers is 1 , also give an answer as a ratio involving both 1 and a number greater than or equal to 1 (for example, the odds \(5: 2\) and \(3: 8\) can be reduced to \(2.5: 1\) and \(1: 2.67\) ).