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avaldez1
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A new school randomly assigns a fivecharacter student code to every prospective student. The school uses the characters 1, 2, 3, 4, 5, W, X, Y, and Z. If none of the student codes contain a repeated character, what is the total number of codes that can be randomly assigned?
 2 years ago
 2 years ago
avaldez1 Group Title
A new school randomly assigns a fivecharacter student code to every prospective student. The school uses the characters 1, 2, 3, 4, 5, W, X, Y, and Z. If none of the student codes contain a repeated character, what is the total number of codes that can be randomly assigned?
 2 years ago
 2 years ago

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Agent47 Group TitleBest ResponseYou've already chosen the best response.1
9*8*7*6*5 per student, but I'm not sure
 2 years ago

terenzreignz Group TitleBest ResponseYou've already chosen the best response.0
^I believe so
 2 years ago

terenzreignz Group TitleBest ResponseYou've already chosen the best response.0
Do you want to know the details? ;)
 2 years ago

terenzreignz Group TitleBest ResponseYou've already chosen the best response.0
ok, well, each student gets five characters right, so the first character can be one of the nine possible characters get me so far?
 2 years ago

Agent47 Group TitleBest ResponseYou've already chosen the best response.1
So you have 9 characters, and each student gets a 5 character code. So suppose you have 5 boxes: _ _ _ _ _ The first box can be filled with any of the 9 characters. Now you've used up that character. So since there are no repetitions, the 2nd box can be filled with any of the characters that are left.
 2 years ago

Agent47 Group TitleBest ResponseYou've already chosen the best response.1
So for the first box you have 9, then for the next one you used up one and now have 8, then you have used up two characters, so for the third one you have 7 characters left out of nine to use because you are not allowed repetitions.
 2 years ago

Agent47 Group TitleBest ResponseYou've already chosen the best response.1
Thus: 9*8*7*6*5
 2 years ago

Agent47 Group TitleBest ResponseYou've already chosen the best response.1
If you were allowed repeating characters, you would have: 9*9*9*9*9 because for the first box you have 9, then for the next one you can pick whatever you want, so 9 again, etc.
 2 years ago
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