Multiple Choice Questions on Find the value of the given series 1 2 3 4 5 6 7 hellip hellip hellip hellip 95 96 97 98 ........ for CDS Exam Preparation

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Multiple Choice Questions

Find the value of the given series 1 2 3 4 5 6 7 hellip hellip hellip hellip 95 96 97 98 ........

Quantitative Aptitude (CDS) Simplification
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    Find the value of the given series-

    1-2+3-4+5-6+7………….+95-96+97-98

    30

    Incorrect Answer

    -49

    Correct Answer

    -52

    Incorrect Answer

    76

    Incorrect Answer
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    Explanation:

    (1+3+5+7+......97)-(2+4+6+......+98)

     n1=97+½=49

    n2=98/2

    Sum =(n1)^2-n2(n2+1)

    =(49)^2-49×50

    =-49

    By: bhavesh kumar singh
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