How many handshakes in African-US summit ?

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During the African-US summit last year, 10 presidents left the conference room and greeted one another. Assuming no 2 presidents repeatedly greeted themselves, how many total handshakes were effected?

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Nishant Guru Asked on 31st July 2015 in Math Puzzles.
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  • 1 Answer(s)

    90

    Explanation:

    formula is nCr = (n!)/(r!*(n-r)!)
    n = 10
    r = 2

    Pranav Jain Scholar Answered on 27th April 2016.
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