Suppose that a monopolist sells to two groups that have constant elas- ticity demand curves, with elasticity 1 and 2. The marginal cost of pro- duction is constant at c. What price is charged to each group?

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.