anonymous
  • anonymous
There are 9 squares on a tic tac toe board, In how many different ways can the first 2 moves be made?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Would I just start off with \[9 P 2?\]
mathstudent55
  • mathstudent55
The first move can be made in how many ways?
anonymous
  • anonymous
2 ways? so \[9C2\] ?

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mathstudent55
  • mathstudent55
You are correct. The answer is 9P2 which equals 72. You can make 9 different moves for the first move. Then for the second move, there are 8 empty squares, so you can make 8 different second moves. 9 * 8 = 72
mathstudent55
  • mathstudent55
Here order matters, so 9P2 is correct.
anonymous
  • anonymous
ahah ohh I thought I was making a mistake in my steps LOL. Thank you! :D
mathstudent55
  • mathstudent55
Sorry for confusing you. You were correct all along.

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