1 out of 1,000 births results in fraternal twins; 1 out of 1,500 births results in identical...

Question:

1 out of 1,000 births results in fraternal twins; 1 out of 1,500 births results in identical twins. Identical twins must be the same sex but the sexes of fraternal twins are independent. If two girls are twins, what is the probability that they are fraternal twins?

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