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.
Determine if input is odd
give nth decimal place of pi
Area of an Isoceles Triangle
find a specific element from an matrix
Calculating selling price
multiply an array by its position number
find the mean of all elements in a matrix
modulus of a number
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