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28 Jan 2018, 23:26
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D
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Difficulty:
5%
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Question Stats:
92% (00:59) correct
8%
(01:10)
wrong
based on 187
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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
A. 30
B. 70
C. 700
D. 720
E. 1000
28 Jan 2018, 23:32
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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
Sent from my Redmi Note 4 using GMAT Club Forum mobile app
In this problem along with selection order is important. So, we should use permutation.
(10P3)=10*9*8=720 ways
Sent from my Redmi Note 4 using GMAT Club Forum mobile app
05 Jun 2018, 09:49
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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
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
