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There are 2 urns. Urn A contains 3 white and 4 red balls, and Urn B contains 2 white and 5 red balls. Answer only

There are 2 urns. Urn A contains 3 white and 4 red balls, and Urn B contains 2 white and 5 red balls. Answer only 1.

1. If a white ball is drawn, what is the probability that it came from Urn A?

Hint: Construct a tree similar to the one below
W 2/9 URN A 1/2 R 7/9 Make a Choice 2/7 W URN 1/2 B R Each urn has an 5/7 equal chance of being picked first

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