PutnamSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemHow many invertible 2×22\times22×2 matrices are there over the field F3\mathbb{F}_{3}F3 (that is, ∣GL2(F3)∣|GL_2(\mathbb{F}_{3})|∣GL2(F3)∣)?Check Show answer Walk through it step by step Practice more like this Review this concept