Aperson belonging to the left-wing majority group of the russian social democratic worker's party was called a marinsky menshevik bolshevik populist

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: (