The numbers are coprime so the only number that goes into them is 1.
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The factors of 74 are 1, 2, 37 and 74. For them to be common, they need to be compared to another set of factors.
The factors of 49 are:
1, 7, 49
The factors of 77 are:
1, 7, 11, 77
The factors of 84 are:
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
The factors for 74 are 1, 2, 37 and 74. The factors for 26 are 1, 2, 13 and 26. So 1 and 2 are their only common factors.
HCF(26, 74) = 2.
They are 1 and 2
1 and 74 2 and 37
The factors of 36 are 1,2,3,4,6,9,12,18,and 36.The factors of 74 are 1,2,and 37.The greatest common factor of 36 and 74 is 2.