Question

    Select the number from among the given options that can replace the question mark ‘?’ in the following series.

    21, 25, 33, 49, ‘?’, 145

    A 81 Correct Answer Incorrect Answer
    B 89 Correct Answer Incorrect Answer
    C 87 Correct Answer Incorrect Answer
    D 82 Correct Answer Incorrect Answer

    Solution

    21 + 4 = 25 25 + 8 = 33 33 + 16 = 49 49 + 32 = 81 81 + 64 = 145

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