There is a grid of 20 squares by 10 squares. How many different rectangles are possible?
(Note that square is a rectangle).

Do the solutions posted so far account for all the "odd" rectangles, if there are any, like the one formed by (1,10), (5,1), (5,20) and (10,5) (if that is even a rectangle) ?

Posted by Penny on 2004-01-21 10:47:08