3 and 9 are factors of 18. 3 is prime, 9 isn't.
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The factors of 18 are: 1 2 3 6 9 18The prime factors are: 2 3
9 is not a prime factor, but it does have one prime factor, which is three. Prime factors are factors of a number that are prime.
largest prime factor of 18 & 24 = 3factors of :18= 1, 3, 6, 9, 1824= 1, 2, 3,4, 6, 8, 12, 24,prime factors of 18 & 24 = 2, 3largest prime factor of 18 & 24 = 3
Both 6 and 9 have the number 3 as a prime factor. 6 = 3 x 2 9 = 3 x 3
The prime factor of 9 is 3. For it to be common, it needs to be compared to another set of prime factors.