Groups and FieldsMediumCosets and Lagrange's Theorem ShareCosets and Lagrange's Theorem · Medium problemWhat is the smallest k≥1k\ge1k≥1 with ak≡1(mod30)a^k\equiv1\pmod{30}ak≡1(mod30) for every aaa coprime to 303030?Check Show answer Walk through it step by step Practice more like this Review this concept