This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Return a list sorted by number of occurrences
Find the maximum number of decimal places in a set of numbers
Min of a Matrix
Sum the 'edge' values of a matrix
find a specific element from an matrix
Determine whether the input is divisible by 3 as well as 5
Find the last digit
Find remainder when x is divided by 3
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