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    Question

    What will come in place of (?) in the given number series.

    3, 9, 15, 21, ?, 33
    A 12 Correct Answer Incorrect Answer
    B 18 Correct Answer Incorrect Answer
    C 13 Correct Answer Incorrect Answer
    D 27 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Observe the difference between numbers:

    9 – 3 = 6

    15 – 9 = 6

    21 – 15 = 6

    → Constant difference of 6
    So, next term = 21 + 6 = 27

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