Question
Select the correct option that will replace the question
mark in the following series. 63, 72, 81, ?, 99, 108, 117Solution
63 + 9 = 72 72 + 9 = 81 81 + 9 = 90 90 + 9 = 99 99 + 9 =108 108 + 9 = 117
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