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Identical twins come from the same egg and hence are of the same sex. Fraternal twins...

Identical twins come from the same egg and hence are of the same sex. Fraternal twins have a 50-50 chance of being the same sex. Among twins the probability of a fraternal set is 13 and an identical set is 23 . If the next set of twins are of the same sex, what is the probability they are identical?

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