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.
03 - Matrix Variables 5
Add a row of zeros on top of a matrix
Find the area of a triangle
Find the last digit
modulus of a number
find a specific element from an matrix
Calculating selling price
multiply an array by its position number
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