Problema Solution
how many ways can a student pick 5 questions from an exam containing 12 questions?
Answer provided by our tutors
Since the order of the picking is not important we are dealing with combinations:
C(12, 5) = 12!/(5!(12 - 5)!)
C(12, 5) = 12!/(5!*7!)
C(12, 5) = 8*9*10*11*12/120 (since 5! = 120)
C(12, 5) = 792
The student can pick the 5 questions in 792 ways.