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July 7th, 2012, 11:50 AM  #1 
Member Joined: Jun 2012 Posts: 91 Thanks: 0  Combinations of four digits that will result in "13"
The ship Titanic carried 1309 passengers when it sank in 1912. The supersticious one might add the numbers this way 1+3+0+9, and 1+9+1+2, and in both cases find the sum of 13.(the well known "Unlucky" number). How many combinations of four digits (09) will be "13" when added one by one ,and what´s the easiest , and most correct, way to calcuate this. Thanks for any answer. 
July 7th, 2012, 11:55 AM  #2 
Member Joined: Jun 2012 Posts: 91 Thanks: 0  Re: Combinations of four digits that will result in "13"
I already found the answer to be 480 when I did my own wuite advanced chart, and somehow I think there might be an easier, more "brilliant" method to find the answer, an equation perhaps?

July 7th, 2012, 03:33 PM  #3  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038  Re: Combinations of four digits that will result in "13" Quote:
 

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