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The highest common factor is 9

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72 = 2 x 2 x 2 x 3 x 3

45 = 3 x 3 x 5

90 = 2 x 3 x 3 x 5

factors in common: 3 x 3 (1, 3 & 9)

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Q: What are the common factors of 72 and 45 and 90?
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