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Greg is renting movies from the video store. He must choose 3 videos
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Bunuel
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Greg is renting movies from the video store. He must choose 3 videos [#permalink] New post  28 Jan 2018, 22:26
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Greg is renting movies from the video store. He must choose 3 videos from a list of 10 videos and decide in which order to watch them. How many schedules of videos can he create?

A. 30
B. 70
C. 700
D. 720
E. 1000
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Sreesha9758
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Re: Greg is renting movies from the video store. He must choose 3 videos [#permalink] New post  28 Jan 2018, 22:32
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Answer is D.


In this problem along with selection order is important. So, we should use permutation.

(10P3)=10*9*8=720 ways

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Re: Greg is renting movies from the video store. He must choose 3 videos [#permalink] New post  05 Jun 2018, 08:49
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Other way of solving:
choosing 3 movies out of 10 can be done in 10c3 ways = 120
the selected 3 movies can be watched in 3! ways.

so, selecting AND watching can be done in 120*3! ways = 720

Bunuel wrote:
Greg is renting movies from the video store. He must choose 3 videos from a list of 10 videos and decide in which order to watch them. How many schedules of videos can he create?

A. 30
B. 70
C. 700
D. 720
E. 1000
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Re: Greg is renting movies from the video store. He must choose [#permalink] New post  01 May 2019, 23:54
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Re: Greg is renting movies from the video store. He must choose [#permalink]
01 May 2019, 23:54
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