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Multiplication Table (Posted on 2006-07-07) Difficulty: 3 of 5
Imagine a multiplication table (like the one below, except it continues on forever):

   1   2   3   4     
 +---+---+---+---+---
1| 1 | 2 | 3 | 4 |...
 +---+---+---+---+---
2| 2 | 4 | 6 | 8 |...
 +---+---+---+---+---
3| 3 | 6 | 9 | 12|...
 +---+---+---+---+---
4| 4 | 8 | 12| 16|...
 +---+---+---+---+---
 |...|...|...|...|...

Find three of the same number in a straight line somewhere within the table. If this is not possible, show why not.

No Solution Yet Submitted by tomarken    
Rating: 3.0000 (4 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: A better answer | Comment 10 of 12 |
(In reply to A better answer by Old Original Oskar!)

Note that in OOO's post, when the 3 points are defined as:
(x,y),  (x+a,y-b), and  (x-ac,y+bc)  and he concludes that c=-1,
this means that the 3rd point is identical to the 2nd point proving there can be only two numbers in straight line.


  Posted by Larry on 2006-07-08 15:57:09

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