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Sum Square Grid Row & Column ≠ 0 (Posted on 2010-04-29) Difficulty: 3 of 5
Each cell of a 1997x1997 square grid contains either +1 or -1, with no cell being vacant.

The product of all the numbers in the ith row, and the product of all the numbers in the ith column are respectively denoted by Ri and Ci.

               1997
Prove that  Σi=1(Ri + Ci) is always nonzero.

No Solution Yet Submitted by K Sengupta    
Rating: 2.0000 (2 votes)

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Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Solution - (MS Word Formatting!?) Comment 6 of 6 |
(In reply to re: Solution - (MS Word Formatting!?) by farcear)

It's best to use a text editor, such as Notepad, rather than a word processor, such as Word. 

word processors have much embedded, invisible formatting stuff that gets carried over, not conducive to any method of entry in the comments.


  Posted by Charlie on 2010-04-30 02:17:37
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