Situation: I am sitting on the chair closest to the door in the third row , visualizing if the student could see me while I am standing in front near the blackboard.
Alternative situations: I sat in the chair by the wall and to my left were three other chairs. I am standing behind the second row of chairs, last chair on the right side looking over the next row of chairs in front of me.
Question: Is the total amount of chairs in the room odd or even?