Question
Select the number from among the given options that can
replace the question mark (?) in the following series. 54, 69, 86, 105, ?, 149, 174Solution
54 + 15 = 69 69 + 17 = 86 86 + 19 = 105 105 + 21 = 126 126 + 23 = 49 149 + 25 = 174
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