find the first elements of a column matrix
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 15 - classes
Multiply a column by a row
Change string to number
find the mean of all elements in a matrix
Find remainder when x is divided by 3
multiply an array by its position number
Calculating selling price
Determine whether the input is divisible by 3 as well as 5
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