Which is not a way to create balance in art?

Symmetrical balance can be established by drawing an imaginary line through the center of the work, either horizontally or vertically, and making each half identically or very visually similar.

Explanation:

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.