Whatever isn't 1, 2, 3, 5, 6, 10, 15, 30
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The Greatest Common Factor of 30, 40: 10
Any multiple of 30 has these factors.
60.
The lowest common FACTOR of any set of numbers is 1. Perhaps you meant the Lowest Common MULTIPLE, which for 6, 10, 15 is 30. Or you meant the HIGHEST Common Factor, which for 6, 10, 15 is 1.
There is no common factor for one number. A common factor can be found between one or more numbers. For example, the GCF of 30 and 48 is 6.