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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)

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

I copied the previous post from MS Word to prevent random Firefox crash from losing whatever I had typed but it seems to have added random tags too.
Do you use Normal or Pre-Formatted?


  Posted by farcear on 2010-04-29 12:23:46
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