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.
Sum the elements in either diagonal of a square matrix
Returning a "greater than" vector
Swap two numbers
What's size of TV?
multiply an array by its position number
Find remainder when x is divided by 3
find a specific element from an matrix
Calculating selling price
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