Suppose the probability of an event occurring is p(a) , and the probability of the event not occurring is p(a’). if p(a)=s and p(a’) = t which of the following equations must be true ? a. t= 1-s b. s= 1+t c. s= t-1 d. t= s+1!

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours