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