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    3. Quantitative Aptitude
    4. Arithmetic Progression
    5. What is the sum of the first 14 terms of an arithmetic progression if the first term is -21 and last

    Question

    What is the sum of the first 14 terms of an arithmetic

    progression if the first term is -21 and last term is 40?
    A 113 Correct Answer Incorrect Answer
    B 143 Correct Answer Incorrect Answer
    C 133 Correct Answer Incorrect Answer
    D 123 Correct Answer Incorrect Answer

    Solution

    First term of AP = a = - 21 & last term = l = 40 Number of terms = n = 14 Sum of AP = n/2 (a + l)   = 14/2 (- 21 + 40) => 19 x 7 = 133

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