In a sports club with 30 members, 18 play badminton and 19 play tennis and 2 do not play either. How many members play both badminton and tennis?	Choose the correct option
A) 7
B) 8
C) 9
D) 10
E) 11
Let x play both badminton and tennis so 18-x play only badminton and 19-x play only tennis. 2 play none and there are total 30 students. hence,   (18-x)+(19-x)+x+2=30   39-2x+x=30   39-x=30   x=9   So 9 members play both badminton and tennis.   9
<result>C</result>
In a sports club with 30 members, 18 play badminton and 19 play tennis and 2 do not play either. How many members play both badminton and tennis?