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Suppose each child born is equally likely to be a boy or a girl. Consider the family with exactly three children. List the eight elements in the sample space whose outcome are all possible gender of three children. Write each of the following evens as a set and find its probability: The event that exactly one child is girl.

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There are eight possible outcomes: `{GGG,GGB,GBG,BGG,BBB,BBG,BGB,GBB}`
The event that exactly one child is girl. is` 7/8`
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