NDA Exam-II 2012 – Which number Fits at the question mark?

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Which number Fits at the question mark?

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    13

    The solution can be determined by only looking at the circle with the missing number.  Starting with the lowest number (1), move clockwise incrementing by 4:

    1, 5, 9, *13*, 17, 21

    Arguably, the answer could be determined with question marks for every slice except one in the circle since the upper left increments by 2, the upper right by 3 and the lower left by 5: starting from the upper left circle, the increment increases by 1 as you move clockwise to the next circle and the minimum value is always in the same position.

    dougbell Genius Answered on 22nd October 2015.
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