What was important about ping-pong diplomacy? a. while kissinger was writing messages, the teams were secretly playing ping-pong. b. while ping-pong was being played, there could be no war. c. while sports were played in public, negotiations were made in secret. d. while nixon was worried about vietnam, the chinese were negotiating with taiwan.

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: (