Find different ordered arrangements-episodes are posssible

Reference no: EM13142118

A drama fan has taped 9 episodes (on nine different videotapes)of a drama. however, he only has time to watch four episodes. suppose he selects four tapes at random.

1. how many different ordered arrangements of episodes are possible?
2. if the finale is on tape, what is the probability he will select and watch this episode last.

Reference no: EM13142118

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