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The greatest common factor of 20, 21, and 25 is 1. Although 20 and 25 can be divisible by 5, 21 can not. Therefore, the only common factor between these three numbers is 1 and it's the greatest one as well.

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15y ago

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More answers
  1. Greatest Common Factor (GCF) of (20,25) is 5
  2. Least Common Multiple (LCM) of (20,25) is 100
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Wiki User

14y ago
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The Greatest Common Factor of 20, 25, 40: 5

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Wiki User

13y ago
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The HCF of 20 & 25 is 5.

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Wiki User

12y ago
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The GCF of 10, 20, and 25 is 5

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Wiki User

8y ago
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The GCF is 1.

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Wiki User

9y ago
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Q: What is the greatest common factor of 20 21 and 25?
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