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The least common factor of 30 and 42 is the smallest number that is a factor of both of them and is 1.
However, I suspect that you mean either:
- What is the highest common factor of 30 and 42?
hcf = 6;
- What is the lowest common multiple of 30 and 42?
lcm = 210.
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The least common factor of 30 and 42?
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What is the different greatest common factor of 30 and 42?
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