Question

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

    7, 6, 10, 27, 104,

    A 615 Correct Answer Incorrect Answer
    B 515 Correct Answer Incorrect Answer
    C 415 Correct Answer Incorrect Answer
    D 315 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    7 × 1 – 1 = 6, 6 × 2 – 2 = 10, 10 × 3 – 3 = 27, 27 × 4 – 4 = 104, 104 × 5 – 5 = 515

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