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    Question

    What will come in place of the question mark (?) in the

    following series? 2.5, 6.5, 18.5, 54.5, 162.5, 486.5, ?
    A 1558.5 Correct Answer Incorrect Answer
    B 1158.5 Correct Answer Incorrect Answer
    C 1458.5 Correct Answer Incorrect Answer
    D 1428.5 Correct Answer Incorrect Answer
    E 1468.5 Correct Answer Incorrect Answer

    Solution

    2.5 × 3 – 1 = 6.5 6.5 × 3 – 1 = 18.5 18.5 × 3 – 1 = 54.5 54.5 × 3 – 1 = 162.5 162.5 × 3 – 1 = 486.5 486.5 × 3 – 1 = 1458.5

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