The common factors of 15 and 25 are 5 and 1. The greatest common factor is five.
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The number is 1.
The Greatest Common Factor (GCF) of 27, 81, and 54 is 27.
No, 18 is not a factor of 81.
1, 2, 3, 6, 9, 18.
At present there are 54 independent countries in (or on the continent) of Africa.