Question
Select the number that can replace the question mark (?)
in the following series. 135, 140, 147, 158, 171, 188, 207, ?Solution
135 + 5 = 140 140 + 7 = 147 147 + 11 = 158 158 + 13 = 171 171 + 17 = 188 188 + 19 = 207 207 + 23 = 230
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