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Outcomes & Event Probability for Genders of Children

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Outcomes and event probability
Suppose that the genders of the three children of a family are soon to be revealed. An outcome is represented by a string of the sort GBB (meaning the oldest child is a girl, the second oldest is a boy, and the youngest is a boy). The outcomes are listed in the table below. Note that each outcome has the same probability.
For each of the three events in the table, check the outcome(s) that are contained in the event. Then, in the last column, enter the probability of the event.

Events Outcome Outcome Outcome Outcome Outcome Outcome Outcome outcome
BBB BGG GGG BGB BBG GBG GBB GGB Probability
2 or more boys
A boy on each of the first 2 births
A girl on the second birth

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Outcomes and event probability for gender of children in a family are determined.

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For the first event, we want to check off all outcomes that have more than 2 B's. ...

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