A 3x3 square grid must be filled with numbers 1,2,3 in such a way that the sum of numbers in every line and column is a multiple of 3. How many different ways are there?
The possible solutions are
a) 54
b) 81
c)
d) 12
I don't know how to get started!
The possible solutions are
a) 54
b) 81
c)
d) 12
I don't know how to get started!