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Among 10,000 twin births, there were 4350 male pairs, 4150 female pairs and 1,500 male-female pairs. What are the number of monozygotic and dizygotic twins in this population?

I know that the 1500 male female twins have to be dizygotic. How do I find out about the same sex twins? We're suppose to use probability involving the punnet square to figure it out but I'm not sure how to do it or if there is another method. Thanks.

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