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Thread: handshakes....

  1. #1
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    handshakes....

    At a Party, all the members shook hands with other members. There were 91 hankshakes. So howmany members are there ?

    --------------------
    suresh


  2. #2

    Question Re: handshakes....

    Quote Originally Posted by psuresh1982 View Post
    At a Party, all the members shook hands with other members. There were 91 hankshakes. So howmany members are there ?

    --------------------
    suresh
    i guess the answer is 182...


  3. #3
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    Re: handshakes....

    The answer is 14

    Lack of WILL POWER has caused more failure than
    lack of INTELLIGENCE or ABILITY.

    -sutnarcha-

  4. #4
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    Re: handshakes....

    Yes sutnarcha..You are absolutely correct...can you post your solution ?
    It will help to other...

    ------------------
    suresh


  5. #5
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    Re: handshakes....

    I used the following formulae

    ε (x-1,x-2,x-3.2)=91

    here,
    ε is sum of (sigma).
    x is number of members, unknown.
    The series is only till 2 because we need at least 2 members to shake hands.
    91 is given.
    Its not so easy, took some time for me.

    Lack of WILL POWER has caused more failure than
    lack of INTELLIGENCE or ABILITY.

    -sutnarcha-

  6. #6
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    962

    Re: handshakes....

    i have one more equation....

    n(n+1)/2=91.

    If you simply this one, you will get the answer 13. You will add one more to this result...13+1 = 14. Because inital handshake coming from two members..

    -------------
    suresh


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