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 Squares in a cross (Posted on 2006-05-10)
In the diagram formed of twenty O’s below, in how many ways may four be selected such that they form a square? What is the least number of O’s 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 No Rating

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

You are missing a couple of squares:

`  ox  xxxxxxxooxxxxx  xx  xo`
so it seems you´d have to get rid of an extra "o".
 Posted by Federico Kereki on 2006-05-10 09:08:52
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