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I'm just stuck on a few questions. Can anyone offer me some assistance?

a) In families with four children, what proportion of the families will have at least one boy?

b) In families with two girls and one boy, what fraction of the families will have the boy as the second child?

c) In family with four children, what fraction of the families will have the gender order male-female-female-male?

I know these questions deal with probability and numbers but I don't know where to begin.

Thanks in advance

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# Homework Help: Genetics/ Probability Problems

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