Of the 40 specimens of bacteria in a dish, 3 specimens have a certain

Of the 40 specimens of bacteria in a dish, 3 specimens have a certain trait. If 5 specimens are to be selected from the dish at random and without replacement, which of the following represents the probability that only 1 of the 5 specimens selected will have the trait? 1) (5/1)/(40/3) 2) (...)