84 = 2 * 2 * 3 * 7
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
Answer: 12
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1,2,3,4,6,7,12,14,21,28,42,84
84 has 12 factors: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.
The prime factors of 84 are: 2,3,7The prime factors of 360 are: 2,3,5
The composite factors of 84 are: 4, 6, 12, 14, 21, 28, 42, 84.
The common factors of 21 42 and 84 are 21