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11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-6

  • question_answer
    If there are 15 person in a party, and if each of them shake hands with each other. Then the number of handshakes happen in the party is:

    A)  110                 

    B)  75           

    C)  120                             

    D)  105

    Correct Answer: D

    Solution :

    [d] Required no. of handshakes in the party \[=\frac{n\left( n-1 \right)}{2}=\frac{15\times 14}{2}=\frac{210}{2}=105\]


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