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Two baskets A and B each contains a mixture of oranges and limes,all of the same size. Basket A contains 26 oranges and 13 limes. Basket B contains 18 oranges and 15 limes. A child selected a basket at random and picked a fruit at random from it.
(a) Illustrate this information by a probability tree diagram
(b) Find the probability that the fruit picked was an orange.