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There are two bags of counters, bag X and bag Y.
There are 20 counters in bag X.
11 of the counters are blue and the rest are red.
There are 16 counters in bag Y.
9 of the counters are blue and the rest are red.
Arkady takes at random a counter from bag X and takes at random a counter from bag Y.
(a) Complete the probability tree diagram.