There are 3 factor pairs of 76:
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The factor pairs of 51 are (1,51) and (17,3)
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
Since 4 is a factor of 76, it is automatically the GCF.
The GCF is 4.
The factor pairs of 98 are (1,98), (2,49), and (7,14).