The GCF of 2 and any even number is 2.
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By definition, every even number has 2 as a factor. That means that every set of even numbers will have at least 2 as a common factor. The GCF might be higher, but if it has 2 as a factor, it's even.
No not always as for example the GCF of 7 and 21 is 7
The GCF is 2.
There's a lot of possibilities. Any set of consecutive even numbers has a GCF of 2.
No, the GCF of any two numbers may be odd or even. For instance:The GCF of 2 and 4 is 2The GCF of 3 and 6 is 3The GCF of 14 and 21 is 7.