2 A bag contains three red counters, four green counters, two yellow counters and one white
 counter. Two counters are drawn from the bag one after the other, without being replaced.
 Calculate:
 a P(two red counters)
 b P(two green counters)
 c P(two yellow counters)
 d P(white and then red)
 e P(white or yellow, in either order but not both)
 f P(white or red, in either order but not both).
 g What is the probability of drawing a white or yellow counter first and then any colour second?