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    Question

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

    7, 7, 21, 105, 735,

    ? 
    A 7712 Correct Answer Incorrect Answer
    B 5120 Correct Answer Incorrect Answer
    C 6615 Correct Answer Incorrect Answer
    D 6205 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, 7 × 1 = 7 7 × 3 = 21 21 × 5 = 105 105 × 7 = 735 735 × 9 = 6615

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