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The composite factors of 75 are 15,25 and 75.
Factors can be prime or composite. The factors of 30 are 1,2,3,5,6,10,15 and 30. Of these, 3 and 5 are prime. The rest are composite except for 1, which is neither.
The composite factors of 42 are: 6, 14, 21, 42.
39 is composite because its factors are:1x393x13(1, 3, 13, 39)39 is a composite number because it has other factors aside from 1 and itself.The other factors of 39 are 3 and 13.
All numbers have factors. Some factors are prime numbers, some are composite numbers. A factor that is a composite number is a composite factor.