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.
Remove the air bubbles
Project Euler: Problem 1, Multiples of 3 and 5
02 - Vector Variables 3
Find remainder when x is divided by 3
Find the last digit
find the mean of all elements in a matrix
Determine whether the input is divisible by 3 as well as 5
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