It depends on the numbers. The GCF of 25 and 26 is 1, but the GCF of 25 and 50 is 25. No matter what, it will be an odd number.
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Whether odd or even, you won't find the GCF of a single number. You need at least two numbers to find a GCF.
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 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.
Because odd numbers don't have any even factors so they can't have one in common.
No. The GCF of 6 and 15 is 3.