Mesopotamian pyramids differed most from Egyptian pyramids in their: triangular solid shape.
function as a temple.
symbolic connection to the gods.
use of stone as a material.

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.