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Banking Quantitative Aptitude Sample Paper Quantitative Aptitude Sample Paper-25

  • question_answer
    The sum of all even numbers between 21 and 51 is                                                                      [SSC (10+2) 2010]

    A) 518                              

    B) 560

    C) 540      

    D) 546

    Correct Answer: C

    Solution :

    Required sum \[=22+24+26+...+50\]
    Number of terms =15 terms
    \[{{S}_{n}}=\frac{n}{2}[2a+(n-1)d]\]
    \[=\frac{15}{2}[2\times 22+(14)\times 2]\]
    \[=\frac{15}{2}[44\times 28]=\frac{15}{2}\times 72=540\]


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