A psychologist is experimenting with white and black mice which have been divided into 2 groups. In group I, there are 7 white mice and 4 black mice. In group II there are 18 white mice and 13 black mice The probability that the psychologist selects a mouse from either group is the same. The psychologis selects a white mouse at random but forgets from which group it came from. Find the probability that it came from group I.

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