Let S be the sample space for an experiment. Let S = {O1, O2,O3,O4,O5}. Assume that Pr[{O1}] = 0.1 and Pr[{O4}] = 0.25.
Assume that O2 and O3 are equally likely and that O5 is three times as
likely as O2. Find Pr[{O2}] and Pr[{O5}].