SOLUTION: A students' council with 22 members must select 3 students to help run a fundraiser. This is to done by randomly selecting 3 names from the 22 names available. The council has 3 st

Algebra ->  Probability-and-statistics -> SOLUTION: A students' council with 22 members must select 3 students to help run a fundraiser. This is to done by randomly selecting 3 names from the 22 names available. The council has 3 st      Log On


   

Question 911262: A students' council with 22 members must select 3 students to help run a fundraiser. This is to done by randomly selecting 3 names from the 22 names available. The council has 3 students from grade 9, 4 students from grade 10, 10 students from grade 11, and the remainder from grade 12. Determine the probability that 2 out of the 3 names are chosen from the same grade.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
22 TOTAL: 3F,4S,10J, 5S
select 3
P(2 of the 3 are in the same grade)
P =