No. All final four teams have been from different conferences, but not all 4.
The Big East had 3 teams in the Final Four in 1959. California def. West Virginia (Big East) in the championship...Louisville (Big East) and Cincinnati (Big East) lost in the Final Four. (I don't know if those teams were in the Big East back in 1959, but they are currently)
The "Final Four" are the four teams that win the regional championships in the NCAA basketball tournament, thus becoming the final four teams in the tournament.
The four teams in the 2010 NCAA final four are:DukeWest VirginiaButlerMichigan State
The four teams in the final four (in 2008) come from Memphis, California, North Carolina, and Kansas.
Four teams per division
The Final Four are the last standing teams of March Madness in either NBA or NCAA basketball. There are two final games involving the Final Four, two games involving two of the Final Four teams. The two teams that win each of the Final Four games move on to the National Championship, the final game of the season (for NCAA).
I believe that it was #1 UCLA and #2 Michigan.
The NBA has a total of four rounds (quarterfinal, semifinal, conference final, THE finals) in the playoffs, for each conference (East and West). That means a total of 16 teams (8 in each conference) will be determined by their regular season records to participate in the playoffs. Well after the quarter final and semifinal rounds in the playoffs. 2 teams in each conference play against each other in the conference final or 3rd; the first team to get 4 victories gets to play in the championship round ( 1 team from each conference plays against each other) and the similar guidlines apply to determine the Championship winner.
16 teams total make the NBA playoffs, 8 teams from the Western Conference and 8 teams from the Eastern Conference. The teams with the eight best records in each conference will play in the playoffs. Division leaders are placed within the top four, and the next best record is also in the top four.
2008 is the first year, since teams began being seeded in 1979, that four #1 seeds made the Final Four. Those teams are North Carolina, Kansas, Memphis and UCLA.
The four teams are Connecticut, Michigan State, Villanova and, North Carolina