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    5. The sum of all even numbers between 31 and 61 is

    Question

    The sum of all even numbers between 31 and 61

    is
    A 620 Correct Answer Incorrect Answer
    B 630 Correct Answer Incorrect Answer
    C 690 Correct Answer Incorrect Answer
    D 670 Correct Answer Incorrect Answer

    Solution

    Sum of first n even numbers = n (n + 1)  Required sum = Sum of 30 even numbers from 1 to 60 – sum of 15 even numbers from 1 to 30  = 30 × 31 – 15 × 16  = 930 – 240 = 690

    Practice Next
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    Relevant for Exams:

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