college math

A couple plan to have exactly three children.
(a) Construct a tree diagram and list the sample space.
(b) Find the probability that the family has at least two girls.

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asked by Rose
  1. hard to do a tree diagram here, but the sample space would be

    BBB
    BBG
    BGB
    BGG
    .
    .
    .
    GGG

    "at least two" girls means either all girls or 2 girls and a boy.

    count those cases and put over 8

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    posted by Reiny
  2. Thanks Reiny, you are absolutly right.

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    posted by Rose

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