Fill in each location with a number from 1-15 such that each number is the difference between the two locations immediately below it. Each number should be used only once.

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I have tried solving this without a program, looking for number patterns in 3 level and 4 level pyramids. Found 2 different solutions to the 3 level, but cannot find a solution for the 4 level one! Little help???

Posted by David on 2004-07-13 22:50:55