Answer :

mel2169

 Factors of 539:
1, 7, 11, 49, 77, 539

Factors of 1540:
1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540

Common Factors:   1, 7, 11, 77

GCF (greatest common factor) = 77

Hope this helps. :)

Other Questions