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    Question

    6, 17, 21, 47, ?,

    107 What will come in place of the question mark (?) in the following series?
    A 61 Correct Answer Incorrect Answer
    B 51 Correct Answer Incorrect Answer
    C 71 Correct Answer Incorrect Answer
    D 81 Correct Answer Incorrect Answer
    E 91 Correct Answer Incorrect Answer

    Solution

    6 × 2 + 5 = 17 17 × 1 + 4 = 21 21 × 2 + 5 = 47 47 × 1 + 4 =  51 51 × 2 + 5 = 107

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