OPM 2015 Problem 1
- Final day 1
A number of three digits is said to be firmwhen it is equal to the product of its unit digit by a number formed by the remaining digits. For example, is firm because . How many firm numbers are there?
Dataset text AI-MO AoPS. Quoted with source.
Official text: Portuguese Mathematical Olympiad 2015 official paper, page 1.
Solutions
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