One of two Urns is picked at random (equally likely). Urn 1 has 7 black marbles and 13 red marbles (for 20 total). Urn 2

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answerhappygod
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One of two Urns is picked at random (equally likely). Urn 1 has 7 black marbles and 13 red marbles (for 20 total). Urn 2

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One of two Urns is picked at random (equally likely).
Urn 1 has 7 black marbles and 13 red marbles (for 20 total). Urn
2 has 4 black marbles and 6 red marbles (for 10 total). If two
black marbles are chosen from the selected Urn, what is the
probability that the selected Urn is Urn 1?
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