North Carolina, Duke, NC State and Maryland.
The Philadelphia Warriors defeated the Chicago Stags 4 games to 1 to win the 1947 championship. The NBA in 1947 was known as the Basketball Association of America. The name was changed to National Basketball Association in 1949 when the BAA merged with teams from the National Basketball League.
a lot of teams. In fact, about 100!
Michigan state and North Carolina
There were 53 teams in the 1984 NCAA Men's Basketball Championship (5 play-in games before the tournament).
9 different teams have entered the tournament ranked #1 and were undefeated and won the tournament, with UCLA doing it 4 times for a total of 12 times this has happened.
Lots of teams did not win. Only 9 teams actually won the championship.
In 1990 Georgia Tech and Colorado shared the national championship.