combinatorics and probability

Question

A math quiz is generated by randomly choosing 5 questions from a test bank consisting of 50 questions. How many different quizzes are possible ? 

Answer 1

₁₀C_{5; order isn't important, just the content of 5 specific questions, so it's a combination problem.}

 

on the other hand, a great teacher in a class of known cheaters would be advised to make different arrangements, in which case the (higher) answer would be ₁₀P_5.

 

Which answer is chosen depends on the definition/interpretation of different.