Asking a multiple choice question without providing the choices doesn't really seem fair.
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No.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. 3 is a factor of 9. 3 is a factor of 15. 3 is a common factor of 9 and 15.
No. 24 has 3 as a factor. 30 has 15 as a factor.
No odd whole numbers have 12 as a factor. 1 and 3 are odd numbers that are factors of 12.
you use the greatest factor