Create a product table in this format:
P = [ 1 2 3 4 5;
2 4 6 8 10;
3 6 9 12 15;
4 8 12 16 20]
Sorted highest to lowest?
Make a random, non-repeating vector.
Change the sign of even index entries of the reversed vector
Add a row of zeros on top of a matrix
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