They are 48, 96 and 192 because the numbers are being doubled after each other
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6, 12, 18, 24, 30,
6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90.
A. 12 and 18
3, 6, 9, 12, 15, 18 4, 8, 12, 16, 20, 24 6, 12, 18, 24, 30, 36 Common multiples include 12, 24, 36, 48, 60, 72
The hcf is 12