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    Question

    the following question, select the missing number from

    the given alternatives. 20, 340, 500, 580, [?], 640
    A 610 Correct Answer Incorrect Answer
    B 620 Correct Answer Incorrect Answer
    C 600 Correct Answer Incorrect Answer
    D 630 Correct Answer Incorrect Answer

    Solution

    The pattern followed here is as follows: The difference between two consecutive numbers is halved as we move from left to right, starting from '320' between the 1st number and the 2nd number. 20 + 320 = 340 340 + 160 = 500 500 + 80 = 580 580 + 40 = 620 620 + 20 = 640 So, '620' will come in place of '?'. The complete series is: 20, 340, 500, 580, 620, 640 Hence, option b.

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