3, ____, 9, 12, 15 3, 6, 9, 12, ____ 9, 12, 15, ____, 21 ____, 15, 18, 21, 24 18, 21, ____, 27, 30 18, 21, 24, ____, 30 ____, 15, 18, ____, 24 ____, 6, 9, ____, 15, 18, 21, ____, 27, ____

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