Question

    Find the missing number in the given number series.

    /> 6, 15, 35, 66, 108, ?
    A 370 Correct Answer Incorrect Answer
    B 151 Correct Answer Incorrect Answer
    C 161 Correct Answer Incorrect Answer
    D 223 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Observe the differences: 15 - 6 = 9

    35 - 15 = 20

    66 - 35 = 31

    108 - 66 = 42

    Now check second differences: 20 - 9 = 11

    31 - 20 = 11

    42 - 31 = 11 ⇒ Constant second difference.

    Next difference = 42 + 11 = 53

    Missing number = 108 + 53 = 161

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