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.
Back to basics 8 - Matrix Diagonals
Set the array elements whose value is 13 to 0
Generate a random matrix A of (1,-1)
Area of a disk
Sum of series VI
multiply an array by its position number
Calculating selling price
Find remainder when x is divided by 3
find a specific element from an matrix
Determine whether the input is divisible by 3 as well as 5
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