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Express each number in terms of its prime factors.

105 = 3 x 5 x 7

189 = 3 x 3 x 3 x 7

The prime factors common to both numbers are 3 and 7.

The greatest common factor is therefore 3 x 7 = 21

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15y ago

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More answers

The GCF is 21.

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Wiki User

12y ago
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It is: 5

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7y ago
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Q: What is the greatest factor of 84 and 105?
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