A teacher randomly selects 3 students to clean the classroom. There are 6 girl and 4 boy students in the class. What is the probability the teacher will select exactly 2 girls?  Choose one
A) 3/7
B) 7/11
C) 1/3
D) 2/5
E) 2/3
Combination Probability Formula: nCr = n!/[r!(n-r)!]   Total possible, select 3 students from 10 students = 10C3 = 10!/[3!(10 - 3)!] = 120.   To have 2 girls there must be 1 boy, select 1 boy from 4 = 4C1 = 4.   And, select 2 girls from 6 = 6C2 = 15.   2 girls and 1 boy = (4)(15) = 60   Probability = (number outcomes favorable)/(total number outcomes) = 60/120 = 2/3   Answer: 2/3
<result>E</result>
A teacher randomly selects 3 students to clean the classroom. There are 6 girl and 4 boy students in the class. What is the probability the teacher will select exactly 2 girls?