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Expert · Puzzle #645
2
5
8
1
2
6
4
5
9
5
3
4
9
3
5
4
7
6
9
3
4
1
6
2
"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding." — William Paul Thurston
"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding." — William Paul Thurston
Set a personal best time today. Write it down. Tomorrow, try to beat it by one second.
Set a personal best time today. Write it down. Tomorrow, try to beat it by one second.