3 = prime
9 = 3*3
18 = 2*3*3
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Common factors of 9 and 18 are: 1, 3, and 9.
The proper factors of 18 are 2, 3, 6, and 9. All factors of 18 are 1, 2, 3, 6, 9, and 18. Prime factors of 18 are 2 x 3 x 3.
The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 153 are: 1, 3, 9, 17, 51, 153 The common factors are: 1, 3, 9
factors of 18: 1, 2, 3, 6, 9 and 18 prime factors of 18: 2, 3 composite factors of 18: 6, 9, 18
3 and 9 are factors of 18. 3 is prime, 9 isn't.