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 the 3n+1 sequence for n
Arrange vector in ascending order
Calculate distance travelled when given radius and rotations
modulus of a number
find the mean of all elements in a matrix
Find the last digit
Find remainder when x is divided by 3
Calculating selling price
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