Asked by Math

Signals
The king has 10 (different) colored flags that he uses to send coded messages to his general in the field. For example, red-blue-green might mean “attack at dawn” and blue-green-red may mean “retreat.” He sends the message by arranging three of the flags atop the castle wall.

The maximum number of such coded messages is _______.

(Give your answer as a whole number.)
Answered by Damon
10! /(10-3)! = 10!/7! = 10*9*8
Answered by Damon
Google "permutations" by the way.
Answered by Math
I got 518400 but it's considered wrong.
Answered by Damon
90*8 - 720
Answered by Damon
10*9*8 = 720, not 518400
Answered by Steve
Hmmm. 518400 = (10*9*8)^2
Why did you use that?
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