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Squares in a cross (Posted on 2006-05-10) Difficulty: 3 of 5
In the diagram formed of twenty Os below, in how many ways may four be selected such that they form a square? What is the least number of Os that may be removed such that none of these squares remains intact?
O O
O O
O O O O O O
O O O O O O
O O
O O
Note: the horizontal and vertical spacing should be equal.

See The Solution Submitted by Jer    
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Some Thoughts re(2): Solution | Comment 3 of 5 |
(In reply to re: Solution by Federico Kereki)

Actually, I think I made another mistake also, I think we would have to get rid of 7 o's to eliminate the possibilty of making any squares, including the 2 extra you found.
  Posted by tomarken on 2006-05-10 09:57:58

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