Question

    Select the number from among the given options that can

    replace the question mark (?) in the following series. 612 615 621 630 642 ?
    A 653 Correct Answer Incorrect Answer
    B 657 Correct Answer Incorrect Answer
    C 659 Correct Answer Incorrect Answer
    D 655 Correct Answer Incorrect Answer

    Solution

    612 + 3 = 615 615 + 6 =  621 621 + 9 = 630 630 + 12 = 642 642 + 15 = 657

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