No, 2 is a common factor of all even numbers but not necessarily the greatest common factor.
Take 40 and 32: 40:1,2,4,5,8,10,20,40 32:1,2,4,8,16,32
8 is the greatest common factor of these two even numbers.
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No. Odd numbers only have odd factors. They could not have an even factor in common.
No, the GCF of 6 and 7 is 1.
No. The GCF of 6 and 15 is 3.
No, but it's always an even number.
No, the GCF of an odd an even number is not always 1. Odd and even numbers can share factors other than 1. For example, the greatest common factor of 5 and 10 is 5.