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Answer:
If the GCF is 6, the numbers must be 6a and 6b, where a and b are mutually prime.
Step-by-step explanation
First number is 18, so a = 3.
Numbers that are mutually prime to 3 (which share no common factors to 3) are: 2, 4, 5, 7, 8, 10, 11, …
If b = 2, then the second number would be 2 x 6 = 12.
This works. The LCM of 12 and 18 is 36. The GCF of 12 and 18 is 6.
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