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How many ways can you place 5 x's and 4 o's in a 3 by 3 tic-tac-toe grid?

 Dec 15, 2019
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Make the 3 by 3 grid as  9 squares in a row. the number of ways to do this is 9 choose 5 or 9 choose 4, or 126.

 Dec 15, 2019

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