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Anonymous
The factors of 165 are:
1, 3, 5, 11, 15, 33, 55, 165
The factors of 231 are:
1, 3, 7, 11, 21, 33, 77, 231
The common factors are:
1, 3, 11, 33
The Greatest Common Factor (GCF) is:
33
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The GCF is 15.
The GCF is 33.
The GCF is 1.
15
The GCF is 5.
The GCF is 35.
The GCF is 25.
The GCF of 1225 and 1575 is 175
Since 25 is a factor of 175, it is automatically the GCF.