Three-letter call signs In 1912 the U.S. government began issuing licenses to radio stations. Each station was given a unique three-letter "call sign." By international agreement, the United States received rights to all call signs beginning with the letters W, N, and K. Radio stations in the western United States were given call signs starting with K. Stations in the East were given call signs starting with W. (N was reserved for use by the U.S. Navy.) (a) How many three-letter call signs (like WGO) start with the letter W? 3. (b) How many three-letter call signs starting with W or K were available for U.S. radio stations?

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