Which composer was NOT a member of "The Russian Five?" A. Cui
B. Balakirev
O C. Stravinsky
O D. Mussorgsky

i think the answer to your question is o c

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.