It is not possible to give a sensible answer to this question. A common factor refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
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The common factors of 30 and 21 are 1 and 3.
The common factors of 30 and 63 are 1 and 3.
1,30 2,15 3,10 5,6 Common factors are factors that two or more numbers have in common. A single number cannot have common factors. A single number can have factors, prime factors, and proper factors. The factors of 30 are listed above. The prime factors of 30 are 2, 3, and 5.
The common factors of 30 and 40 are: 1, 2, 5, 10.
The common factors of 10 and 30 are: 1, 2, 5, and 10