1. Radio and television stations in the USA and Canada have names which are basically four letter words. These words must begin with either a K, a W or a C and may use a blank as the last letter. For instance both WHO and CKLW are acceptable names.
(a) How many such station names are possible?
(b) How many of these are three-letter names [the last letter is a blank]?
(c) How many of these names use the same letter throughout the name?