Four statistical questions need detailed answer , THx

[lucy]

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[topsquark]

So. Why don't you tell us what you need help with? We aren't going to do your homework for you.

-Dan

 

[HOI]

(29) A "tic-tac-toe board" has 9 positions. There are 9 places to put the first "X", then 8 places to put the next, and then 7 places to put the last: there are total of 9(8)(7)= 504 possible configurations for 3 "X"s on the board. How many of those have all three "X"s in the same vertical column? How many have all three in the same horizontal row? How many diagonal are there?