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What are the common factors of 15 and 27?

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The Greatest Common Factor (GCF) of some numbers, is the largest number that divides evenly into all of the numbers. Like, the GCF of 10,15, and 25 is 5.
User Nicolai Schmid
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15: 1, 3, 5

27: 1, 3, 9,

User Ziwon
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