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 elements unique to either input
Reverse the elements of an array
Min of a Matrix
Replacing a row
Determine whether the input is divisible by 3 as well as 5
modulus of a number
multiply an array by its position number
Find the last digit
find the mean of all elements in a matrix
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