Ambiguity is a logical mistake made by the law of the middle of the row in violation of the basic law of ordinary logic  The law of the middle of the row requires that the propositions made by the same object with contradictory relations or lower opposition relations cannot be denied at the same time and in the same relationship
If we deny them all, we will make the mistake of ambiguity
It's not that someone went to the exam, and it's not that no one went to the exam.