Each of the capital letters in bold in this 3x3 grid is to be substituted by a different digit from 1 to 9 such that :
A B C
D E F
G H I
- Each of A, C, G and I is even, and:
- The sum of the digits in each of the four 2x2 subgrids is equal.
Disregarding the rotations and reflections, how many distinct solutions are there?
(In reply to computer solution
You forgot to make the corners even.
Looking at your list I see only
2 5 4
9 3 7
6 1 8
Which does have equal sums of 19.
Edited on August 18, 2009, 2:06 pm
Posted by Jer
on 2009-08-18 14:05:40