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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2002

  • question_answer
    15 persons shaked their hands with one another in a room. Total number of shake hand is

    A)  90               

    B)  105

    C)  110              

    D)  115

    Correct Answer: B

    Solution :

     First person shakes his hand remaining 14 persons. Second person shakes his hand remaming 13 persons. Similarly, third person shakes his hand remaining 12 persons. Hence, total number of shake hands \[=14+13+12+11+...+1\] \[=\frac{14(14+1)}{2}\] \[=7\times 15=105\]


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