SOLUTION: 4. How many 3-letter code words are possible using the first 8 letters of the alphabet if a) No letter can be repeated ? b) Letters can be repeated ?

Question 761742: 4. How many 3-letter code words are possible using the first 8 letters of the alphabet if
a) No letter can be repeated ?
b) Letters can be repeated ?

Answer by ramkikk66(644) (Show Source): You can put this solution on YOUR website!
Using ABCDEFGH
a) If no letter can be repeated:
First letter of he 3 letter combo can be chosen in 8 ways.
Second letter can be chosen only in 7 ways (because you can't repeat the 1st letter)
Third letter can be chosen in 6 ways.
So, total number of combinations =
b) If letters can be repeated, each letter of the combination can be chosen in 8 ways, so the number of combinations is
:)
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