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Anonymous
The prime numbers of 2 and 3 are common to 12 and 18 and so 2*3 = 6 which is their highest common factor
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The hcf is 12
The GCF is 2.
lcm(9, 12) = 36; hcf(9, 12) = 3.
The GCF is 3.
If you mean 24 and 36 then the HCF is 12