The GCF is 2.
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UMmmmm. before I answer I had some corrections there....! Its probably greatest common factor not highest common factor Its answer is """"""""""""""""""""2""""""""""""""""""""""""""""""" thank you!
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.
6
The greatest common factor of the numbers 12 and 42 is 6.
6.