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Math Help - urgent

  1. #1
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    urgent

    n people shake hands at the start of the meeting . If there are 36 handshakes in all , find the value of n .
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  2. #2
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    {n \choose 2} = 36 \mbox{  then  }n=?
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  3. #3
    Junior Member
    Joined
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    n
    C = n(n-1) =36
    2 1*2



    Combinations ( ways to choose two from n people )
    solve quadratic equation and ignore negative solution

    Answer = 9
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