Groups and FieldsSuperchallengeA Gallery of Groups ShareA Gallery of Groups · Superchallenge problemHow many matrices A∈GL(2,Z5)A\in GL(2,\mathbb Z_5)A∈GL(2,Z5) (invertible 2×22\times22×2 matrices mod 555) satisfy A2=IA^2=IA2=I?Check Show answer Walk through it step by step Practice more like this Review this concept