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Math Help - number of combinations

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    number of combinations

    in how many ways can 7 out of 21 students catch the flu
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  2. #2
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    Combinations.
    {21 \choose 7} = \frac {21!} {(7!)(14!)}
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by aymers14 View Post
    in how many ways can 7 out of 21 students catch the flu
    Only 1 way....when each of the 7 come into contact with the flu virus.
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