Multiple Choice Questions on The sum of first 13 terms of an A P whose first term and third term are 5 and 15 respectively is nbs........... for CDS Exam Preparation

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Multiple Choice Questions

The sum of first 13 terms of an A P whose first term and third term are 5 and 15 respectively is nbs...........

Quantitative Aptitude (CDS) Arithmetic progression
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    The sum of first 13 terms of an A.P. whose first term and third term are 5 and 15 respectively is?

     

    500
     

    Incorrect Answer

    340
     

    Incorrect Answer

    455
     

    Correct Answer

    none of these
     
     

    Incorrect Answer
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    Explanation:

     first term a=5
     third term=a+(n-1)d
     15=5+2d
     d=5
     sum of 13 term is=13/2(2×5+12 × 5)
     =13(10+60/2)
     =13×35
     =455

    By: bhavesh kumar singh
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