Can you solve the tic-tac-toe board problem? Here is the question: How many ways can you completely fill a tic-tac-toe board, which is a 3x3 grid, with five Xs and four Os? The rule to this problem is that you cannot count layouts that are reflection or rotations of other layouts. The solution deals with the mathematics of symmetry.
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Here is the tic-tac-toe board problem: 00:15