Question 55
Let us call a year *colored* if the decimal representation of its number has no repeating digits. For example, all years from $2013$ to $2019$ are colored, unlike $2020$.
a) Find the nearest chain of seven consecutive colored years in the future.
b) Can a chain of more than seven consecutive years happen in the future?
a) Find the nearest chain of seven consecutive colored years in the future.
b) Can a chain of more than seven consecutive years happen in the future?