Asap giving 30 points + brainliest + ! when you change between the c and d7 chords, you would use a common finger a guide finger both a common finger and a guide finger no common or guide fingers

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.  

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sorry if this is wrong