Of the number of three athletic teams in a school, 21 are in the basket ball team , 26 in hockey team and 20 in the football team, 14 play hockey and basket ball , 15 play hockey and football, 12 play football and basket ball and 8 play all the games. How many members are there in all?

In a group of athletic team in a school 21 are in the basket ball team,26 in the hockey team and 29 in the football team.If 14 play hockey and basketball,12 play football and basket ball,15 play hockey and football and 8 play all the three games,find the following. How many players are there?

Twenty eight matches were played in a volley ball tournament. Each team playing one against each of others. How many teams were there?

Let A= {Ram,Geeta, Akbar} be the set of students of class XI, who are in school hockey team. Let B ={Geeta, David , Ashok} be the set of students from class XI who are in the scholl foot ball team. Find AuuB and interpret the set.

In a class of 80 students numbered 1 to 80, all odd numbered students opt for cricket, students whose numbers are divisible by 5 opt for football and those whose numbers are divisible by 7 opt for hockey. The number of students who do not opt any of the three games, is a)13 b)24 c)28 d)52