Answer:
6
Step-by-step explanation:
6x1 = 6, 6x3 = 18
The GFC of 6 and 18 is 6
6 = 1, 2, 3, 6
18 = 1, 2, 3, 6, 9, 18
*Number that divides both 6 and 18 is 6*
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