A coworker of mine has taken a certification exam twice and has seen the same ten questions on both exams. I am curious if it is possible to determine the total number of questions in the question pool from the number of questions per exam and the number questions common to both exams.
The exam has fifty-one questions, and in taking it twice for a total of one hundred and two questions, it was determined that ten of the questions appeared on both exams. Also, I am curious if this is even enough information to determine the answer.
Mathematics has never been my strong point.