Let O1 = individual 1 is O- and O2 = individual 2 is O- .
Since the two individuals are randomly selected, we assume that O1 and O2 are independent. Find P(both are O-).
P(both are O-) = P(O1 ∩ O2) = P( O1) P(O2) = (0.07)(0.07) = 0.0049