Solve the Problem or Be Unemployed Challenge

Another r/theydidthemath feature, this question is allegedly from a job interview, and unlike some other strange interview puzzles I've seen - this one has some pretty straightforward and definitive patterns. That would make it a terrible question, but it goes out of its way to exclude many reasonable answers so there ends up being one pretty definitive solution by the end. #interviewquestions #mathpuzzle #maths

Original Thread: www.reddit.com/r/theydidthemath/comments/1iuzdgn/r…

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0:00 Intro
0:29 1
0:54 3
1:37 3 again
3:12 5
4:43 Real Solution
6:27 Conclusion