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...
Least common multiple of many numbers
middleAsColumn: Return all but first and last element as a column vector
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Cat, Meowcat and Concatenation
Magnet and Iron
row-th maximum row elements
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