Question 16
A number $A=20192019\ldots2019$ is formed by writing $2019$ next to itself $n$ times. What is the least positive $n$ for which $A$ is divisible by $9$?
Answer format: enter the integer answer without units. Leading zeros are optional; the original paper uses four-digit boxes.
Answer format: enter the integer answer without units. Leading zeros are optional; the original paper uses four-digit boxes.