It is: 1 but the highest is 7
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The GCF is 7.
7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.
To find the lowest common multiple (LCM) of two numbers, we first need to find the prime factorization of each number. The prime factorization of 42 is 2 x 3 x 7, and the prime factorization of 49 is 7 x 7. To find the LCM, we take the highest power of each prime factor that appears in either number, which gives us 2 x 3 x 7 x 7 = 294. Therefore, the lowest common multiple of 42 and 49 is 294.
The least common factor of any set of integers is 1.
The Greatest Common Factor (GCF) is: 7