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A bag contains 10 balls of which 7 are green and 3 are white. A ball is picked at random from the bag and

A bag contains 10 balls of which 7 are green and 3 are white. A ball is picked at random from the bag and its colour is noted. The ball is not replaced. A second ball is then picked out. Using a tree diagram, determine the probability the (i). first ball is green. (ii). first ball is green and the second ball is white. (ii). balls are of different colours.

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