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    Question

    12, 18, 28, 42, 52,

    ? What will come in place of question mark (?) in the following series?
    A 62 Correct Answer Incorrect Answer
    B 78 Correct Answer Incorrect Answer
    C 68 Correct Answer Incorrect Answer
    D 72 Correct Answer Incorrect Answer

    Solution

    12 × 1.5 = 18 18 + 10 = 28 28 × 1.5 = 42 42 + 10 = 52 52 × 1.5 = 78

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