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That would be 15.

Only a number ending in five would be a factor of 75. 45 is not. 35 is not. 25 is not. 15 is, and it also is a factor of 90. This makes it the highest common factor of 75 and 90, although it is not a prime factor.

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13y ago
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Q: Highest common factor of 75 and 90?
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