Absolute values of 1-10 in a pyramid form _  _  _  _
 \/ \/ \/
 _  _  _
  \/ \/
  _  _
   \/
   _

With the numbers 1-10, use each number once so that any number is equal to the absolute value of the difference of the upper two numbers. any ideas?

I suspect the problem is this.  Fill in the triangle
a b c d 
. e f g
. .  h i
. . .   j
with the numbers 1 to 10, using each once, so that each number in the last three rows is the absolute value of the difference of the two above it, i.e. e = |a - b|, f = |b - c|, ..., j = |h - i|.
There are, by my count, 8 solutions (of course the left-to-right reflection of a solution is a solution).
