99 cause why who ruled the four zones in germany after wwii? a) the united states, italy, france, and the soviet union b) france, the united states, great britain, and the soviet union c) the soviet union, japan, great britain, and france d) italy, france, japan, and china

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: (