SOLUTION: Every year, students decide which four classes to take each semester. They must take two core classes each semester consisting of Math, Science, English, or Social Studies. There a

Algebra ->  Probability-and-statistics -> SOLUTION: Every year, students decide which four classes to take each semester. They must take two core classes each semester consisting of Math, Science, English, or Social Studies. There a      Log On


   

Question 1163393: Every year, students decide which four classes to take each semester. They must take two core classes each semester consisting of Math, Science, English, or Social Studies. There are 6 electives to choose from for the remaining two classes.
Q: How many different class schedules are possible if each course is assigned to one of the four periods?
I did C(4,2) multiplied by C(6,2) and got 90 as the result but the answer was incorrect.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
C(4,2) is the first one. There are 6 electives to choose from for the third, and after that, there are 5 electives to choose from for the fourth.
6*6*5=180.