In a sports club with 30 members, 17 play badminton and 21 play tennis and 2 do not play either. How many members play both badminton and tennis? Choose the correct choice from the following options
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)+(21-x)+x+2=30   40-2x+x=30   40-x=30   x=10   So 10 members play both badminton and tennis.   10
<result>D</result>
In a sports club with 30 members, 17 play badminton and 21 play tennis and 2 do not play either. How many members play both badminton and tennis?