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If Jeff has four movies, and must choose to watch either 1

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4702
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1596 [0], given: 373

CAT Tests
If Jeff has four movies, and must choose to watch either 1 [#permalink] New post 30 Dec 2017, 14:04
Expert's post
00:00

Question Stats:

100% (01:14) correct 0% (00:00) wrong based on 3 sessions
If Jeff has four movies, and must choose to watch either 1, 2, or 3 different movies, which of the following represents a possible number of different arrangements of movies that Jeff could watch?

Indicate all possible values.

A. 4
B. 6
C. 7
D. 9
E. 12
F. 24

Drill 2
Question: 2
Page: 563


[Reveal] Spoiler: OA
A, E, F

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Sandy
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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4702
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1596 [0], given: 373

CAT Tests
Re: If Jeff has four movies, and must choose to watch either 1 [#permalink] New post 08 Jan 2018, 16:23
Expert's post
Explanation

If Jeff watches one movie, he has four different choices for that one movie, so choice (A) is a correct answer. To find the total number of arrangements of two movies, first write out two slots.

For the first movie, he has 4 choices and a 4 goes in the first slot. For the second movie, he now has three choices and a 3 goes in the second slot. 4 × 3 = 12, so choice (E) is correct.

There are 24 arrangements if he watches three movies: 4 × 3 × 2 = 24. Choice (E) is also correct.

Hence options A, E, and F are correct!
_________________

Sandy
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Re: If Jeff has four movies, and must choose to watch either 1   [#permalink] 08 Jan 2018, 16:23
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If Jeff has four movies, and must choose to watch either 1

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