Multiple Choice Questions on Suppose the series 28 25 29 has 20 terms then the sum of all 20 terms is equal to ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

Suppose the series 28 25 29 has 20 terms then the sum of all 20 terms is equal to ........

Quantitative Aptitude ( CCS) Arithmetic progression
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    Suppose the series 28, 25, ...., -29 has 20 terms then the sum of all 20 terms is equal to:

    -5

    Incorrect Answer

    10

    Incorrect Answer

    -10

    Correct Answer

    5

    Incorrect Answer
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    Explanation:

    Given series is 28, 25, ...., -29 and it has 20 terms with a = 28 and d = -3, l = -29 and n = 20
    The sum of all n-terms in arithmetic sequence with last term(l) = S(n) = n(a+l)/2
    Then, s(20) = 20(28 + (-29)) / 2
    = 20(-1) / 2 = -10

    By: Amit Kumar
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