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 :
 Each of A, C, G and I is even, and:
 The sum of the digits in each of the four 2x2 subgrids is equal.
A B C
D E F
G H I
Disregarding the rotations and reflections, how many distinct solutions are there?
(In reply to
computer solution by Daniel)
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 20090818 14:05:40 