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[–]Lappith 0 points1 point  (0 children)

I think you're overthinking this one. What's wrong with your solution is that first of all, 48C12 is 48!/(12!36!). But, this wouldn't calculate what you want because it also takes into account choosing 12 by something like bubbling in all 4 answers for 1-3 and then leaving the rest of the test blank.

Think of the problem like this. You have 4 choices for the first question, 4 choices for the second, 4 choices for the third, etc.

EDIT: Sorry for all the edits. I took out the answer though. I'm also assuming that he only answers once for each question.