25 and 36
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Any two composite numbers who do not share the same prime factors.15 = 5x322 = 11x2So 15 and 22 have a GCF of 1
They are all composite numbers whose GCF is 1
The GCF is 1.
I take it you are asking for an example, not a definition. Okay. Here are 2: 4 and 9.
The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.