Tic-Tac-Toe Loser

Unknown Author August 22, 2022

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Section: Brain Teasers Category: Deduction

Difficulty: Easy

How many X’s can you place the most on a tic-tac-toe board without getting 3 X’s on a line?

SOLUTION

You can place 6 X’s without getting 3 X’s on a line, as shown below.

If you place 7 X’s on the board, since 3×2<7, at least one of the rows (and also one of the columns) will have 3 X’s.

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