Groups and FieldsHardSubgroups and Cyclic Groups ShareSubgroups and Cyclic Groups · Hard problemIs H={1,9,11,19}H=\{1,9,11,19\}H={1,9,11,19} a subgroup of U(20)U(20)U(20) (multiplication mod 202020)?AYesBNo: 9⋅119\cdot119⋅11 leaves HHHCNo: 111111 has no inverse in HHHDNo: HHH is not a subset of U(20)U(20)U(20)Check Show answer Walk through it step by step Practice more like this Review this concept