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Louis inserts a 12-track CD into a CD player and presses the random play button. This CD player's random function chooses each track independently of

Louis inserts a 12-track CD into a CD player and presses the random play button. This CD player's random function chooses each track independently of any previously played tracks.

a) What is the probability that the CD player will select Louis's favourite track first?

b) What is the probability that the second selection will not be his favourite track?

c) What is the expected waiting time before Louis hears his favourite track?

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