You can answer any 8 questions from the 12 questions on an exam. In how many different ways can you choose the 8 questions, assuming that the order in which you choose the questions is irrelevant?

Answer 1

you must use combination formula.
n!/r!(n-r)!
Sub values
12!/ 4! 8!

! is factorial.

Answer 2

Yes

Answer 3

a student answers 75% on a math exam correct. If he answer 60 questions correctly How many questions are on the exam.