PutnamSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemHow many solutions does x2≡1(mod15)x^2 \equiv 1 \pmod{15}x2≡1(mod15) have with 0≤x<150 \le x < 150≤x<15?Check Show answer Walk through it step by step Practice more like this Review this concept