A pronumeral is a letter that is used to represent a number (or numeral) in a problem.Neither 6 nor 18 has any of those. The common factors of 6 and 18 are 1, 2, 3 and 6.
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The greatest common factor of 18 21 and 42 is 3.
The greatest common factor is 6
The greatest common factor is 6.
198, or 18 times 11. This is the smallest number that will have 11, 18 and 6 as factors. You don't have to worry much about 6, because any number with a factor of 18 will also have 6 as a factor.
The greatest common factor of 18, 30 and 36 is 6