The GCF is 14.
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14 is their highest common factor.
The highest common factor (HCF) of 42, 154, and 168 is 14.The GCF is 14.The GCF is 14.
14 is the GCF of 84, 154 and 168.
The highest common factor of 84, 168 and 182 is 14.
There is no highest common multiple of 56, 98 and 168. Their highest common factor, which you may have meant, is 14.