Question
Select the number that will replace the question mark
(?) in the following series. 51, 54, 59, 66, 77, 90, ?Solution
51 + 3 = 54 54 + 5 = 59 59 + 7 = 66 66 + 11 = 77 77 + 13 = 90 90 + 17 = 107
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