SOLUTION: a teacher has a set of 12 problems to use on a math exam. The teacher makes different versions of the exam by putting 10 questions on each exam. How many different exams can the

Algebra ->  Probability-and-statistics -> SOLUTION: a teacher has a set of 12 problems to use on a math exam. The teacher makes different versions of the exam by putting 10 questions on each exam. How many different exams can the      Log On


   

Question 12369: a teacher has a set of 12 problems to use on a math exam. The teacher makes different versions of the exam by putting 10 questions on each exam. How many different exams can the teacher make?
Answer by kusha(21) About Me  (Show Source):
You can put this solution on YOUR website!
we can make selections of 10 out of 12 in c(12,10) ways
12!/10!2! = 66 ways
so he can make 66 papers