Question 37

Select the number from among the given options that can replace the question mark (?) in the following series.

64, 51, 38, ?, 12, -1

Solution

64-13 = 51

51-13 = 38

38-13 = 25

25-13 = 12

12-13 = -1

So '25' will come in place of the question mark.


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