Question 23
Both equations $x^2-ax+b=0$ and $x^2-bx+a=0$ have positive integer roots. How many distinct values of $a-b$ are possible?
Interpretation: Repeated positive integer roots are allowed.
Answer format: enter the integer answer without units. Leading zeros are optional; the original paper uses four-digit boxes.
Interpretation: Repeated positive integer roots are allowed.
Answer format: enter the integer answer without units. Leading zeros are optional; the original paper uses four-digit boxes.