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.
Which doors are open?
radius of a spherical planet
Project Euler: Problem 7, Nth prime
Do Fast Fourier Transformation
Determine whether the input is divisible by 3 as well as 5
find the mean of all elements in a matrix
Find the last digit
Calculating selling price
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