1,11,7
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1, 7, 11, 77.
13, 77.
The numbers 1, 7, 11, and 77 go equally into 77. 1 x 77 = 77 7 x 11 = 77
The HCF of 28 77 and 91 is 7, since 7 goes into all the numbers and all the numbers above it dont.
The numbers are coprime, so only 1.