A survey is made of sources of news for people in a metropolitan area. It is of interest whether people obtain their news from television (event T), a newspaper (event N), or radio (event R). express the following events in terms of N,R, or T in set theoretic notation.

1. news is obtained from television but not newspapers.
2. news is not obtained from either television or radio
3. none of these three sources is used to obtain news.