Unit Fraction Pairs
How many ordered pairs $(x, y)$ of positive integers satisfy $\frac{1}{x} + \frac{1}{y} = \frac{1}{12}$? Give an integer.
Related problems & prerequisites
Worth solving first
- Square Divisors of a Factorial 4.0/10
- Trailing Zeros 3.0/10
Source: Classic exercise in wide circulation; no traceable original source. Statement written for AxiomIQ.