Multiple Choice Questions on Given that 1 2 2 2 3 2 n 2 n 6 n 1 2n 1 Then 10 2 11 2 12 2 20 2 ........ for CDS Exam Preparation

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Multiple Choice Questions

Given that 1 2 2 2 3 2 n 2 n 6 n 1 2n 1 Then 10 2 11 2 12 2 20 2 ........

Quantitative Aptitude (CDS) Simplification
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    Given that 1^2+2^2+3^2+....n^2=n/6(n+1)(2n+1)

    Then, 10^2+11^2+12^2+.....+20^2=?

    2585

    Correct Answer

    2740

    Incorrect Answer

    3410

    Incorrect Answer

    1280

    Incorrect Answer
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    Explanation:

    (Sum of squares 1 to 20) - (sum of squares 1 to 9)

    =20×(20+1)(2×20+1)/6 - 9×(9+1)(2×9+1)/6

    =20×21×41/6 - 9×10×19/6

    =2870-285=2585

    By: bhavesh kumar singh
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