QWD3-Q30

notidgen

Q30:

The membership of a committee consists of 3 English teachers, 4 Mathematics teachers, and 2 Social Studies teachers.  If 2 committee members are to be selected at random to write the committee’s report, what is the probability that the two members selected will both be English teachers?

 

A.        2/3

B.         1/3

C.        2/9

D.        1/12

E.         1/24

答案是d，请nn指教思路

bellamama

这个题我做prep的时候遇到过

C(3,2)/C(9,2)=1/12