A bag contains 2 red and 1 green balls. Another bag contains 2 red and 2 green balls. A bag is selected at random and then a ball was drawn from it. If it was found to be red, then the probability that it has been drawn from the first bag is:
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2/7
2/7
2/7
2/7
2/7
2/7
2/7
2/7
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