Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-4

  • question_answer
    The simplified value of \[\left( 1-\frac{1}{3} \right)\left( 1-\frac{1}{4} \right)\left( 1-\frac{1}{5} \right)...\left( 1-\frac{1}{99} \right)\left( 1-\frac{1}{100} \right)\]is

    A)  \[\frac{2}{99}\]            

    B)  \[\frac{1}{25}\]

    C)  \[\frac{1}{50}\]            

    D)  \[\frac{1}{100}\]

    Correct Answer: C

    Solution :

    \[\left( 1-\frac{1}{3} \right)\left( 1-\frac{1}{4} \right)\left( 1-\frac{1}{5} \right)...\left( 1-\frac{1}{99} \right)\left( 1-\frac{1}{100} \right)\] \[=\frac{2}{3}\times \frac{3}{4}\times \frac{4}{5}\times ...\times \frac{98}{99}\times \frac{99}{100}\] \[=\frac{2}{100}=\frac{1}{50}\]


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