Question 515090
Commercial radio station call letters are composed of four letters* of the English alphabet (such as WABC). Stations located east of the Mississippi must start with W. How many different 4-letter radio station call letters are possible? Repetition is permitted.
-------------
--> Wxxx and Kxxx
= 26*26*26 each side of the Mississippi
= 17576 each
= 35152
------------
There are exceptions too, eg, KDKA is in Pittsburgh, PA