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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-3

  • question_answer
    In following series find 20th number \[9,5,1,-3,-7,-11.....\]

    A) \[-64\]                         

    B)  \[-75\]

    C)         \[-70\]                

    D)        \[~-67\]                      

    Correct Answer: D

    Solution :

    First term (a) of \[A.P.=9\] Common difference \[(d)=-4\] So, 20th term \[{{T}_{30}}=a+(20-1)\,(d)\] \[=9+(20-1)\,(-4)\] \[=9-76\] \[=-67\]


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