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.
Make a checkerboard matrix
Create a vector whose elements depend on the previous element
Let's see how peculiar we can get
Deleting an element in a matrix
BASICS - sum part of vector
Calculating selling price
find a specific element from an matrix
multiply an array by its position number
Find the last digit
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