PutnamSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemHow many invertible 2×22\times22×2 matrices are there over the field F5\mathbb{F}_{5}F5 (that is, ∣GL2(F5)∣|GL_2(\mathbb{F}_{5})|∣GL2(F5)∣)?Check Show answer Walk through it step by step Practice more like this Review this concept