number(baseball OR football)
=number(baseball) + number(football) - number(baseball AND football)
29 = 21 + 12 - x
x = 4
4 of them play both sports.
There are 29 students in the class. 21 students are in base ball team and 12 students are in foot ball team...but some students play both the games..how many students play both games?
1 answer