Help please

There are 18 three-letter words that can be formed.

No guest! That answer is not 18, and you know it could not possibly be such a large number!

Think of the word as three spaces:

______  _______ _______
 

Now, each value on top of the spaces is how many options we can choose from:

    3             3              3

______  _______  _______

Now, multiply:

3 * 3 * 3

There! 27.

How could that possibly be 18? Last time I checked, 18 did not equal 27...

Still don't believe me? How many more can you find? Oh, so you found another one? Let me hear. ABCDEFGH? Lovely, maybe I forgot about that one....

:)
 

ilorty: Because you CAN repeat the letters, you have: 3^3 = 27 permutations.

AAA, AAB, AAC, ABA, ABB, ABC, ACA, ACB, ACC, BAA, BAB, BAC, BBA, BBB, BBC, BCA, BCB, BCC, CAA, CAB, CAC, CBA, CBB, CBC, CCA, CCB, CCC, Total No = 27 permutations