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July 7th, 2012, 11:50 AM   #1
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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 (0-9) will be "13" when added one by one ,and what´s the easiest , and most correct, way to calcuate this.
Thanks for any answer.
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July 7th, 2012, 11:55 AM   #2
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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?
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July 7th, 2012, 03:33 PM   #3
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Re: Combinations of four digits that will result in "13"

Quote:
Originally Posted by zengjinlian
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?
480 includes 55 cases with leading 0's : 0049 to 0940
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