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    Question

    21      84       168       

    172      ?      348 What will come in place of the question mark (?) in the following series?
    A 346 Correct Answer Incorrect Answer
    B 342 Correct Answer Incorrect Answer
    C 340 Correct Answer Incorrect Answer
    D 344 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    21 + 4 = 84 84 x 2 = 168 168 + 4 = 172 172 x 2 =  344 344 + 4 = 348

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