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It is: 9
If you mean: 18, 27 and 36 then it is 9
The GCF is 18.
The GCF is 36.
27
It is: 27
3
The GCF is 9.
The GCF is 4.
The GCF is 12.
It is 36
36
The hcf of 12 & 36 is 12
The HCF of both numbers is 9 and 9 times 9 = 81