O O O O O O O O O O O O O O O | Distribute all the numbers 1 to 15 in the circles so that the number in each circle shows the difference between the two circles on which it sits. |
As warm-ups, find solutions for pyramids with 2, 3, or 4 rows.
Source: The UofCF Problem of the Week 2/27/97 The Difference Between Two Circles