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There is not a greatest common factor of a single number, such as 121, because there cannot be a greatest common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor.

The factors of 121 are 1, 11, and 121.
The only prime factor of 121 is 11.

Examples:
The greatest common factor of 11 and 63 is 1.
The greatest common factor of 11 and 154 is 11.
The greatest common factor of 11, 99, and 253 is 11.

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8y ago
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13y ago

The 'C' in "GCF" stands for "common". "Common" means "same for all".

There's nothing common to one single thing. If you're looking for common

characteristics, you need at least two things. There are no common factors

until you have at least two numbers.

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Q: What is the greatest common factor of 121?
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