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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