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Anonymous
The prime factors are:
39 = 3 * 13
143 = 11 * 13
156 = 2 * 2 * 3 * 13
So the greatest common factor is 13.
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The GCF is 13.
The GCF of 65, 143, and 156 is 13.
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13 is the highest common factor of 78, 91 and 156.
The HCF of the given numbers is 13