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The least common factor is a term often mistakenly given to either the greatest common factor (GCF) or the least common multiple (LCM). This term is not often used because it does not describe a useful relationship between numbers. Since 1 evenly divides all integers, 1 is technically the least common factor for any set of integers.

121 and 144 are relatively prime, which means that they share no factors aside from 1.

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Q: What is the least common factor of 121 and 144?
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What is the greatest common factor of 121 and 144?

12 121 = 12 x 11 144 = 12 x 12


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