Answer
D
Work Step by Step
Multiples of 3x: 3x, 6x, 9x, 12x, 15x, 18x
Multiples of x: x, 2x, 3x, 4x, 5x, 6x, 7x, 8x, 9x, 10x, 11x, 12x, . . . 18x
Multiples of 9: 9, 18, 27, 36
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