42 = 2 x 3 x 7
72 = 23 x 32
84 = 22 x 3 x 7
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The GCF is 6.
The prime factors are: 2, 3 and 7. (2 x 3 x 7 = 42)
It is 70 or 42 that have exactly 3 prime factors
The prime factors of 84 are: 2,3,7The prime factors of 360 are: 2,3,5
The common factors of 21 42 and 84 are 21