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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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re: Solution | Comment 2 of 5 |
(In reply to Solution by tomarken)

You are missing a couple of squares:

  ox
  xx
xxxxxo
oxxxxx
  xx
  xo
so it seems youd have to get rid of an extra "o".
  Posted by Federico Kereki on 2006-05-10 09:08:52
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