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anonymous
 one year ago
How many strings of eight uppercase English letters are there if no letter can be repeated?
anonymous
 one year ago
How many strings of eight uppercase English letters are there if no letter can be repeated?

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zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1I'm taking Combinatorics right now, so I NEED to be able to answer a question like this by next week's test lol grrr, it's giving me some trouble though >.< thinking...

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1dw:1442540278852:dwOh maybe this is simpler than I'm making it. So we have 26 options for the first letter, ya? Any uppercase letter from the English alphabet.

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1Let's say that first letter is an F. Then none of the other following 7 spaces can include an F. Meaning that for our next space we have 25 letters to choose from.dw:1442540418212:dw\(\large\rm 26F=25\)

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1So maybe the next letter is an O. So now we can't include F or O for the remaining places. \(\large\rm 26FO=24\)
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