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 On a Grid 2 (Posted on 2007-08-29)
Place eight 'X's on a 4x4 grid so that each 'X' is orthogonally bordered by an even number of 'X's and each empty square is orthogonally bordered by an odd number of 'X's.

Can 18 'X's be placed in a 6x6 grid in this manner?

Note: 'orthogonally' means horizontally or vertically

 No Solution Yet Submitted by Brian Smith Rating: 4.2500 (4 votes)

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 Solution | Comment 5 of 10 |
One way of doing this problem is

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</td> </tr> <tr style="height: 13.9pt;"> <td style="border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; border-width: medium 1pt 1pt; padding: 0in 5.4pt; width: 17.2pt; height: 13.9pt;" valign="top" width="23">

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</td> </tr> </tbody></table>
 Posted by ram on 2007-11-01 04:08:25

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