P(dog) = 0.32
P(cat) = 0.27
P(dog and cat) = 0.12
P(dog but not a cat) = P(dog) - P(dog and cat) = 0.32 - 0.12 =
0.2
                 Â
                 Â
                 Â
                 Â
                 Â
                 Â
                 Â
                 Â
                 Â
                 Â