Multiple Choice Questions on 1 12 1 20 1 30 1 42 1 56 1 72 ........ for CDS Exam Preparation

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Multiple Choice Questions

1 12 1 20 1 30 1 42 1 56 1 72 ........

Quantitative Aptitude (CDS) Simplification
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    ?+1/12+1/20+1/30+1/42+1/56+1/72=?

    7/18

    Correct Answer

    -1/6

    Incorrect Answer

    -1/19

    Incorrect Answer

    1/8

    Incorrect Answer
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    Explanation:

    ?+1/12+1/20+....+1/72

    =1/2×3+1/3×4+1/4×5+1/5×6+1/6×7+1/7×8+ 1/8×9

    =½-?+?-¼+¼-?+?-?+?…..-?+?-1/9

    =½-1/9=7/18

    By: bhavesh kumar singh
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