# Intro to probability

posted 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?