1,2,3,5,6,10,15,30
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1 and 2.
no, 19+19= 38, they have no common factors
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The prime factors of 30 are 2, 3, and 5.
30 has 7 factors
Common factors of 18 and 30 are: 1, 2, 3, and 6.