probability

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a couple is planning to have three children. Find the probability that the couple will have:
a.) 2 girls and 1 boy?
b.) 2 girls followed by a boy?
c.) at least 1 girl?

please answer my question thank you very much, have a good day!

  • probability -

    There are 8 ways to have B G

    a)2 girls and 1 boy ---> GGB GBG BGG
    Prob = 3/8

    b) 2 girls followed by boy --->GGB
    prob = 1/8

    c) at least one girl, means exclude BBB
    prob = 1 - 1/8 = 7/8

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