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Q: Can the GCF of 2 numbers ever be 1?

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The GCF is 1.

No, never.

If one of the numbers is a multiple of the other, the smaller number is the GCF. If the two numbers are prime numbers, the GCF is 1. If the numbers are consecutive, the GCF is 1. If the numbers are consecutive even numbers, the GCF is 2.

The GCF of 2 and 19 is 1. The GCF can't be larger than the smaller of the two numbers. Since 19 is not even, the GCF is 1, and the numbers are coprime.

The GCF is 2. The LCF is 1.

It's not. 78 is the LCM of those numbers. The GCF of those numbers is 1.

3 and 7?

The GCF is 1.

The GCF is 1.

The 2 smallest numbers that have GCF of 479 are 479 and 958.479 x 1 = 479479 x 2 = 958

The GCF is 1.

1, 2, 3

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