It is 1 but the highest common factor is 18
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1, 2, 4, 8.
1, 2, 4, 8.
The GCF is 18.
2. As this is the highest number that goes into both of them :]
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, . . . 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, . . .