Interesting problem but tests are too tricky.
I am not sure that a list of equal numbers qualifies as a series. Would it be a geometric or an arithmetic series?
'Randperm' is making this question a whole lot harder...
Make a simplified barcode
Calculate the area of a triangle between three points
Replace multiples of 5 with NaN
Rounding off numbers to n decimals
Binary code (array)
row-th maximum row elements
Magnet and Iron
Construct a precedence graph from a code segment
Graph Algorithms - 2 : Chromatic Number
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