7,3,2,2
21,2,2
42,2
84
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43 is a prime number and doesn't have a rainbow because it only has one prime factor: itself.
The factors of 84 are 1,2,3,4,6,7,12,14,21,28,42 and 84. To find a greatest common factor, you need to compare them to another number's factors.
A factor rainbow is a way of notating the process of finding the prime factorization of a given number. It's an upside down factor tree. Example: 2107,5,3,235,3,2105,2210
the factor rainbow of 4 is 1,2,4
Yes, 6 is a factor of 84.