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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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  Subject Author Date
MinimumJer2006-05-11 12:24:07
SolutionNo SubjectDej Mar2006-05-10 10:30:56
Some Thoughtsre(2): Solutiontomarken2006-05-10 09:57:58
re: SolutionFederico Kereki2006-05-10 09:08:52
SolutionSolutiontomarken2006-05-10 08:55:33
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