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The Prime Factors of 45 are 1, 3, and 5.

In order to find the prime factors of 45, you need to find the factors of 45. The factors are: 1, 3, 5, 9, 15, and 45. The prime factors of 45 are those that have only 1 and the number itself as factors, so they are 3 and 5. Some think 1 is also a Prime number, but it's neither prime nor composite.

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Q: What are the prime factors of 45?
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