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The George and Stella Saga (Posted on 2005-12-26) Difficulty: 3 of 5

George lives at the corner of 1st Street and 1st Avenue. Each afternoon George visits his girlfriend, Stella, who lives at the corner of 8th Street and 8th Avenue. He varies his route but always walks 1400 meters (it is 100 meters between adjacent Streets and between adjacent Avenues). Sometimes he stops at one of the corner pubs marked as P in the diagram.

On May 1st 2006, after several months of these visits, Stella wants to get married and says to George, "If you don't propose marriage to me soon, I am going to propose to you." George replies, "Starting tomorrow I will walk a different route to your house and when I have used all the different possible routes, you can propose to me." "OK," says Stella, "but you must never go through an intersection with a pub at one of its corners." "It's a deal" replies George.

On what date will Stella be able to propose to George?

See The Solution Submitted by Nosher    
Rating: 3.5000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Some Thoughts answer Comment 11 of 11 |

There are precisely 2130 different possible routes satisfying the conditions of the problem.

Adding 2130 days to  1 May, 2006 we obtain the date

Consequently, Stella will be able to propose to George precisely on 29 February, 2012.

Edited on July 28, 2007, 11:55 am
  Posted by K Sengupta on 2007-07-28 11:54:21

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