What are the difference between history and social history?

History is the study of past events while Social history concentrates upon the social, economic, and cultural institutions of a people

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.