18 August
2025
Triangle and 9 digits puzzle
This puzzle comes from my good friend Amrith.
Fill the three vertices and two spots on each side of the triangle with the numbers 1 thru 9 (using each only once) such that each side adds up to 20.
Multiple solutions are possible.
What approach did you use (other than simple trial and error)?
Answer posted here: https://www.rajibroy.com/2025/08/22/answer-to-triangle-and-9-digits/
Rajib, emailed you some variants of this that are a lot more fun. Using the same formulation as above .. the numbers 1 through 9 and a triangle, and a change that the sides need not have two numbers each.
Here’s one …
Find a set of numbers for the three vertices such that there are two sets of numbers for the sides that each add up to a (the same, or different) constant.
Cool!