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Squares and Rectangles (Posted on 2004-01-21) Difficulty: 2 of 5
There is a grid of 20 squares by 10 squares. How many different rectangles are possible?
(Note that square is a rectangle).

See The Solution Submitted by Ravi Raja    
Rating: 2.0000 (5 votes)

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Solution | Comment 1 of 20
This is simple, there are (21*20)/2 ways to choose the lines for the top and bottom and (11*10)/2 ways to choose the lines for the sides.

21*20*11*10/4 = 11550
  Posted by Brian Smith on 2004-01-21 09:22:00
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