Question 1170759
how many 3-letter words can be made from the letters MATH if 

repetition of letters is allowed?
---
Assuming you mean a combination of letters, not words.
eg, MHT is not a word.
-----------
Each selection is 1 of 4.
---> 4*4*4
==========================
repetition of letters is not allowed? 
1 of 4, then 1 of 3, then 1 of 2.