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25-09-2022
Mathematics

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About 30% of human twins are identical, and the rest are fraternal. Identical twins are necassarily the same sex-half are males and the other half are females. One-quarter of fraternal twins are both male, one-quarter both female, and one-half are mixes:one male, one female. You have just become a parent of twins and are told they are both girls. Given this information, what is the probability that they are identical?

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