1 is the largest number that divides both of those, because 17 is prime and it doesn't divide 48.
(Note that 17*2=34 and 17*3=51)
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The greatest common factor of 48 and 28 is 4.
The Greatest Common Factor of 28, 48 is 4.
8 is the greatest common factor for 48 and 40
The greatest common factor for 36 and 48 is 12.
The Greatest Common Factor of 39, 48, 51: 3