Question

10年1月sat 1.At north high school,the ski club has 15 members

Answer 1

1,

suppose only x students belong to ski club, only y students belong to debate club, z students belong to both clubs.

11=x+y,

15=x+z,

12=y+z,

27=x+y+2z=11+2z,

16=2z,

z=8.

Answer is C.8.

2,

4/4!=1/3!=1/6

Answer is C.1/6