6th Class Mathematics Mental Ability Question Bank Mental Ability

  • question_answer In a party everyone gave a gift to everyone else. If the total number of gifts exchanged in the party was 600. How many person were there in the party?

    A)  20                              

    B)  15           

    C)  10                  

    D)  25

    Correct Answer: D

    Solution :

    Let the total number of persons in the party \[=n\] Then, total number of gifts exchanged in the party\[=n(n-1)\] A/q, \[n\left( n-1 \right)=600\] \[25(25-1)=600\] \[n=25\] Total no. of person\[=25\]


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