The least common factor of any two or more positive integers is always 1
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The least common factor of 12 14 and 2 is 1.The least common factor is the smallest number that divides all three of them, which is 1 for any set of numbers.However, you either mean:The highest common factor of 12, 14 & 2 which is 2 (the largest number that divides all three of them)orThe lowest common multiple of 12, 14 & 2 which is 84 (the smallest number that is divisible by all three of them).
Somone put 30, but seven doesnt go into it
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The LCD of 3/4 and 7/9 is 36.