6
4
7
9
7
1
4
4
7
5
1
8
3
9
6
7
5
3
6
8
9
1
8
2
3
5
9
5
9
2
3
3
1
The number of essentially different Sudoku grids (accounting for symmetry) is 5,472,730,538 — about 5.5 billion.
The number of essentially different Sudoku grids (accounting for symmetry) is 5,472,730,538 — about 5.5 billion.
"The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience." — Immanuel Kant
"The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience." — Immanuel Kant