Gschill Posted May 21, 2007 Share Posted May 21, 2007 Numbering Squares: The numbers 1 to 25 are to be placed on a black and white ( like a checker board) 5 X 5 grid so that each number, except 1, is next to, horizontally or vertically, the number one less than it. (note: all the corners are black squares) a. Explain why the number 1 must be placed on a black square. b. Explain why the numbers 1, 3, 5,7, 9 can not all be placed on one long diagonal. c. Show that in a completed numbering the sum of the numbers on a long diagonal must be at least 33 and that 33 can occur. Link to comment Share on other sites More sharing options...
blike Posted May 21, 2007 Share Posted May 21, 2007 Have you tried at all? What'd you get so far? Link to comment Share on other sites More sharing options...
Gschill Posted May 22, 2007 Author Share Posted May 22, 2007 I have thought alot about it but i still have had no success.. please help me . Link to comment Share on other sites More sharing options...
spooky Posted May 29, 2007 Share Posted May 29, 2007 why don't you show us what you've done so far, so we have an idea of where you are up to.^.^ so we know you've given it a go. Link to comment Share on other sites More sharing options...
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