I'm not sure if order matters in this question. I believe that order matters the way that it is worded with selected, but any insight would help with the question below:
The supply department has 8 different electric motors and 5 different starting switches. In how many ways can 2 motors and 2 switches be selected for an experiment concerning a tracking antenna?
My answer: If order matters and repetition isn't allowed, I believe that it would be:
P(13,4) or 13 Pick 4
Note: This question is a suggested problem, not anything I need to hand in or school related.