The Multiples of 9 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, ? i.e. M9 = {9, 18, 27, 36, 45, 54, 63, 72, 81, 90, ?}. Multiples of 9 are the series of numbers obtained by multiplying 9 with the natural numbers.

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