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    Question

    51, 60, 78, ?, 141,

    186 What will come in place of the question mark (?) in the following series?
    A 140 Correct Answer Incorrect Answer
    B 120 Correct Answer Incorrect Answer
    C 105 Correct Answer Incorrect Answer
    D 150 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    51 + 9 × 1 = 60, 60 + 9 × 2 = 78, 78 + 9 × 3 = 105, 105 + 9 × 4 = 141, 141 + 9 × 5 = 186

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