There was no 1975 World Cup. There was one in 1974 and 1978. See the related link for a list of all participants.
8 teams participated in th opening world cup 1975
14 countries participated in the 2011 Cricket World Cup
9 countries participated in the 1992 Cricket World Cup.
8 countries participated in the 1983 Cricket World Cup.
8 countries participated in the 1987 Cricket World Cup.
15 matches were played in the 1975 Cricket World Cup.
32 teams from different countries participated in the 2010 FIFA World Cup.
14 teams participated in the icc world cup 2011
Fourteen countries partipicated in world cup 2011.
Brazi
13 teams participated in the 1930 World Cup. These are as follows:ArgentinaChileFranceMexicoYugoslaviaBrazilBoliviaUruguayRomaniaPeruUSParaguayBelgium
In 1975 Sri Lankan team played ICC world cup