What number should fill the blank?

Look at this series: V, VIII, XI, XIV, _____, XX ….
(a) XV
(b) XVII
(c) IX

Anurag Mishra Professor Asked on 31st December 2015 in Reasoning Questions.
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    Answer: (b) XVII

    V + 3 = VIII,   VIII + 3 = XI,   XI + 3 = XIV,
    Same as, XIV + 3 = XVII

    Then, the missing number is XVII.

    Hence, the correct answer is option (b) XVII. 

    Anurag Mishra Professor Answered on 31st December 2015.
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