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Verified Answer :

Purplesun

To get the Greates Common Factor (GCF) of 84 and 189 we need to factor
each value first and then we choose all the copies of factors and
multiply them: 

84:   223  7189:     3337GCF:     3  7

The Greates Common Factor (GCF) is:   3 x 7 = 21

Your answer is 21.


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