Number TheoryMediumFermat, Euler and Wilson ShareFermat, Euler and Wilson · Medium problemFor which pair (a,p)(a, p)(a,p) is ap−1≡1(modp)a^{p-1} \equiv 1 \pmod pap−1≡1(modp) false?Aa=21, p=7a = 21,\ p = 7a=21, p=7Ba=20, p=7a = 20,\ p = 7a=20, p=7Ca=35, p=3a = 35,\ p = 3a=35, p=3Da=100, p=13a = 100,\ p = 13a=100, p=13Check Show answer Walk through it step by step Practice more like this Review this concept