Posted by Rachal on Thursday, February 10, 2011 at 7:28pm.
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?

Math  Ronaldo, Thursday, February 10, 2011 at 7:38pm
you must use combination formula.
n!/r!(nr)!
Sub values
12!/ 4! 8!
! is factorial. 
Math  Maphefo, Sunday, April 17, 2011 at 6:44am
Yes

Math  jennfer, Monday, November 17, 2014 at 9:31pm
a student answers 75% on a math exam correct. If he answer 60 questions correctly How many questions are on the exam.