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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)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: My answer | Comment 18 of 22 |
(In reply to My answer by Cindy)

20 x 20 should give 44100 by the formula n(n+1)m(m+1)/4 (see previous comments) with n=m=20, so you missed one. The problem statement is for 20 x 10, however, so the answer to the problem as stated is 11550.
  Posted by Richard on 2004-01-22 16:59:17

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