what is the H.C.F. of the numbers 168,189,231
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Break down the numbers to their prime factors.
168 = 3 x 7 x 2 x 2 x 2
189 = 3 x 7 x 3 x 3
231 = 3 x 7 x 11
As you can see, there is a column of 3 and 7. Consider these as one number, then multiply. 3 x 7 = 21
The GCF (Greatest Common Factor) is 21. Hope this helps.
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