![SOLVED:Radio stations in the United States have call names that begin with either K or W, and can then be followed by any letters, possibly with repeats. Some names have three letters, SOLVED:Radio stations in the United States have call names that begin with either K or W, and can then be followed by any letters, possibly with repeats. Some names have three letters,](https://cdn.numerade.com/ask_images/3fde16b717334cfb8c2cb844c0dead3d.jpg)
SOLVED:Radio stations in the United States have call names that begin with either K or W, and can then be followed by any letters, possibly with repeats. Some names have three letters,
![Canadian broadcasters say 40 TV stations and more than 100 radio stations will shut down over the next few years without government aid | The Star Canadian broadcasters say 40 TV stations and more than 100 radio stations will shut down over the next few years without government aid | The Star](https://images.thestar.com/4Vvfgswg9r1oa7pisz0JPNSw5vI=/1086x749/smart/filters:cb(1600610247653)/https://www.thestar.com/content/dam/thestar/business/2020/09/19/canadian-broadcasters-say-40-tv-stations-and-more-than-100-radio-stations-will-shut-down-over-the-next-few-years-without-government-aid/ckpc.jpg)
Canadian broadcasters say 40 TV stations and more than 100 radio stations will shut down over the next few years without government aid | The Star
![SOLVED:How many different 4-letter radio-station call letters can be made (a) if the first letter must be \mathrm{K} or \mathrm{W} and no letter may be repeated? (b) if repetitions are allowed (but SOLVED:How many different 4-letter radio-station call letters can be made (a) if the first letter must be \mathrm{K} or \mathrm{W} and no letter may be repeated? (b) if repetitions are allowed (but](https://cdn.numerade.com/previews/e233bec6-9a61-4057-9409-87cd7eaa8120_large.jpg)