Ononot — Urn 1 has 3 red, 2 blue. Urn 2 has 1 red, 4 blue. Pick urn a

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Urn 1 has 3 red, 2 blue. Urn 2 has 1 red, 4 blue. Pick urn at random, draw ball. It's red. Prob it came from Urn 1?