Multiple Choice Questions on 12 22 32 42 52 10 2 ........ for CDS Exam Preparation

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Multiple Choice Questions

12 22 32 42 52 10 2 ........

Quantitative Aptitude (CDS) Simplification
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    12 + 22 + 32 + 42 + 52 + ? (10)2 =?

    385

    Correct Answer

    280

    Incorrect Answer

    295

    Incorrect Answer

    355

    Incorrect Answer
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    Explanation:

    Here n = 10

    The\: sum = \frac{10(10+1)(20+1)}{6} = \frac{10\times 11\times 21}{6 } = 385

    By: Munesh Kumari
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