Groups and FieldsMediumCosets and Lagrange's Theorem ShareCosets and Lagrange's Theorem · Medium problemIn Z18\mathbb Z_{18}Z18 let H={0,6,12}H=\{0,6,12\}H={0,6,12}. By listing them, how many different cosets a+Ha+Ha+H are there?Check Show answer Walk through it step by step Practice more like this Review this concept