Question 88
Find all rational numbers $r$ for which all solutions are equations
$$
r x^{2}+(r+1) x+r=1
$$
whole numbers.
$$
r x^{2}+(r+1) x+r=1
$$
whole numbers.
MathNet 2001 — Part 01 Question 88
Math Olympiad Vault · MathNet 2001 — Part 01
Math Olympiad Vault · MathNet 2001 — Part 01