Asked by Amelie

An octave contains twelve different musical notes (in Western music). How many different eight note melodies can be constructed from these twelve notes if:
(a) no note can be used more than once?
(b) any note can be used as often as you please?
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Ans for a) a permutation
12P8 =19,958,400
b) a combination
12C8= 495
Is this correct?
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