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Unfortunately, OP’s concerns are right about the first link. I have written the Euclid contest yesterday. Today, after looking at the title of the first link posted by the OP, I remembered the question immediately. After a quick check on the website, there are at least 3 more questions from the contest (I suspect there are more, but they might have been ...


14

As I am the moderator who dealt with those questions, let me address this issue: first and foremost, let me note that, as an instructor myself, I am sympathetic to the desire to prevent cheating. It offends me when students attempt to use Math SE to cheat on exams or competitions. That being said, the goals and policies of Math SE are orthogonal to these ...


4

To answer the titular question:   The likelihood that a question with 2021 is from a current contest is $1-\dfrac1{2021}$. Well, we all know that this likelihood was already quite high even before Math SE came around, and it only increases over time for questions on Math SE, since cheaters have found (empirically) that they can get away with a large fraction ...


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