Twelve jurors must be picked from a pool of n potential jurors. If m of the potential jurors are rejected by the defense counsel and the prosecuting attorney, how many different possibile juries could be picked from the remaining potential jurors?

1) if one less potential juror had been rejected, it would be possibile to create 13 different juries

2) n= m + 12

I know this question has appeared on the forums before, but I can't seem to understand the solution there. Pls help.

The OA is D