The greatest common factor is 9 because 18 is divisible by 9 and so is 45. It can not be greaater than half of 18 and 45 is not divisible by 18.
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The GCF is 3.
The Greatest Common Factor (GCF) of 144, 45, and 18 is 9.
39 and 45 are not relatively prime because they have 3 as a common factor. Relatively prime numbers have no common factor greater than 1.
The GCF is 9.
The mistake is that there is a greater common factor than 18. It's 36. 36 divides 36 evenly. 36 divides 72 evenly.