In a sports club with 30 members, 17 play badminton and 19 play tennis and 3 do not play either. How many members play both badminton and tennis?  Select the correct option
A) 7  B) 8  C) 9  D) 10  E) 11
Let x play both badminton and tennis so 17-x play only badminton and 19-x play only tennis. 2 play none and there are total 30 students. hence,   (17-x)+(19-x)+x+3=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, 17 play badminton and 19 play tennis and 3 do not play either. How many members play both badminton and tennis?