Hey there!
3,562: 1, 2, 13, 26, 137, 274, 1781, 3562
15b: 1, 3, 5, 15, b
5b: 1, 5, b
☆ Not all of the terms have b in it so we know We can't have that as an answer. Only two of the numbers have b in it
The one you see most common would be the biggest/greatest common factor would be
Answer: GCF: 1 ✅
Good luck on your assignment and enjoy your day!
~LoveYourselfFirst:)