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Answer:
The common factors of 45 and 90 are 45, 15, 9, 5, 3, 1, intersecting the two sets above. In the intersection factors of 45 ∩ factors of 90 the greatest element is 45. Therefore, the greatest common factor of 45 and 90 is 45.
Explanation:
45
find all the factors they have in common and you'll see 45 is the greatest