A family selects two phones from a box containing cellphones: four are Nokia, marked N1, N2, N3, and N4. The other three are Samsung, marked S1, S2, and S3. Two phones are picked randomly in succession without replacement. a) Express the following events as unions of the outcomes (1) One Nokia and One Samsung (2) Both are Nokia (3) Both are Samsung (4) Both are of the same kind b) Determine the probability that each of the following is true - the second pick is a Nokia, given that the first pick is a Samsung - the second pick is a Nokia, given that the first pick is also a Nokia