This principle is defined as: "Using a range of different qualities or instances of an art element to create a desired visual
effect."
Variety
Unity
Contrast
Balance

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.  

answerhenry viii;