a) the probability that at least 1 doesnt use a computer at work Because the question asks for at least 1 that doesn't we have to do the opposite complement. P(E)=1-P(complement) Probablity of not using computer(NUC)=1 - Probability of using computer P(NUC)= 1-P(UC) P(UC)=...
22. A motor boat whose speed is 18 km/h in still water takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream