Three different letters appearing


1- A special type of code word includes 4 upper case letters where exactly two of the letters should be the same and the others different. Thus in total we have three different letters appearing. How many such code words are there?

2- What if we need that 3 of the letters be the same and one is different. How many code words are there now?

Request for Solution File

Ask an Expert for Answer!!
Basic Statistics: Three different letters appearing
Reference No:- TGS0870208

Expected delivery within 24 Hours