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Math Help - How many sets?

  1. #1
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    How many sets?

    How many sets of 3 numbers each can be formed from {1,2,...,20} if no two consecutive integers are to be used?

    I can't figure out how to count this... Can someone explain? Thanks.
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  2. #2
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    Quote Originally Posted by jzellt View Post
    How many sets of 3 numbers each can be formed from {1,2,...,20} if no two consecutive integers are to be used?
    How many ways can you arrange the string 11100000000000000000 so no two 1's are together?
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