July 2018 little math problem

[Thomas Klemm]

(07-26-2018 12:16 AM)Albert Chan Wrote:  If using computer is allowed, I would use Picat Programming Language

Interesting. Never heard of that language.

I just used Python:

Code:

from itertools import permutations

def check(a, b, c, d, e, f, g, h, i):
    return len(set([a+b+c, c+d+e, e+f+g, g+h+i])) == 1

print [x for x in permutations(range(1, 10), 9) if check(*x)]