4 ms·
We know that the GCD is divisible by 9 because the sum of the digits for every row is 45.
by lern_too_spel 2y ago
We know that the GCD is divisible by 9 because the sum of the digits for every row is 45.
- Jtsummers 2y agoNot necessarily. The sum of the digits ranges from 36-45, there are 10 possible digits of which 9 will be used. If, say, 5 were the unused number then it would not be divisible by 9.
- amyres 2y agoExactly. The actual solution to the puzzle in question has a GCD not divisible by 9.
- lern_too_spel 2y agoYou're right. I misread the question. It's 9 of the 10 digits 0-9 instead of all 9 digits 1-9 as in sudoku.