Handshakes riddle

In a get-together i counted the number of handshakes that were exchanged. There were 28 altogether.
Can you tell me how many how many guests were present ?

Share
SherlockHolmes Expert Asked 6 days ago in Logic Puzzles.
Add Comment

  • 1 Answer(s)
    8
    In a group of N people everyone shake hands with N-1 other persons.
    When we multiply N with N-1 we are counting every handshake twice (A=>B is the same as B=>A)
    So the number of handshakes is N(N-1)/2.
    Fill in 8 and we get 8*7/2 = 28
    CugelTheWise Expert Answered 4 days ago.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.
  • More puzzles to try-