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3 is a factor of 51, and 3 is also the largest factor of itself, so 3 is the greatest common factor.

The factors of 3 are 1 and 3.

The factors of 51 are 1, 3, 17, and 51.

The common factors are 1 and 3. Therefore, the greatest common factor is 3.

The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.

The prime factor of 3 is 3.

The prime factors of 51 are 3 and 17.

The common prime factors are a single 3, so the greatest common factor is 3.

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Q: What is the greatest common factor of 3 and 51?
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