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Re:Ask HN: What are your favorite stack overflow posts? by c3534l on Friday September 08, 2017 @03:30PM (#15203282)
I guess this is technically stack exchange, not stack overflow, but the answer to this math question is amazing:

https://math.stackexchange.com/questions/1749853/if-there-ar...

Re:Ask HN: What are your favorite stack overflow posts? by quickthrower2 on Friday September 08, 2017 @06:59PM (#15204578)
That's brilliant. So intuitive.