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Math Help - Binomial probability

  1. #1
    Lawliet
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    Binomial probability

    There's 60% chance that an item will work. You have 7 of these items. What's the chance that 5 out of these 7 items will work?

    I don't need it for homework, but a real world problem. All I really need is an equation so that I can calculate it for other numbers, no major explanation required..
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  2. #2
    Eater of Worlds
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    Binomial.

    C(7,5)(0.60)^{5}(0.40)^{2}
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