Q5. There are 8 counters in a box. The letter A is on 6 of the counters. The letter B is on the other 2 counters. Sally takes at random a counter from the box. She keeps the counter. Then Tina takes at random a counter from the box, (a) Complete the probability tree diagram. Sally Tina A B (3) (b) Work out the probability that both Sally and Tina take a counter with the letter A on it. (2) (c) Work out the probability that at least one counter with the letter A on it is taken.