18.12.9.6.24.27.3.9.21 fill in the nine spaces of the square so that the number of three in each row equals 43
It's impossible because 43 is not a multiple of 3. 18.12.9.6.24.27.3.9.21 is a multiple of 3
It's impossible because 43 is not a multiple of 3. 18.12.9.6.24.27.3.9.21 is a multiple of 3