Amovement during the 1930s and 40s in which large numbers of educated or professional peoples left many european countries for better pay and/or living conditions: a. new feminism b. solidarity c. green movement d. brain drain

You are given the first four terms of an arithmetic sequence. why might you use a recursive formula? why might you use an explicit formula? under what conditions might a recursive formula be preferred over the explicit formula? under what conditions might an explicit formula be preferred over the recursive formula? pleasss ! sorry if it's a long question: (