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How many committees of 5 members can be chosen from a group

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GMAT Club Legend
GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1657 [0], given: 396

CAT Tests
How many committees of 5 members can be chosen from a group [#permalink] New post 24 Nov 2017, 20:45
Expert's post
00:00

Question Stats:

0% (00:00) correct 100% (00:30) wrong based on 1 sessions
How many committees of 5 members can be chosen from a group of 8 people?

A. 28
B. 56
C. 118
D. 336
E. 6,720

Drill 1
Question: 10
Page: 523
[Reveal] Spoiler: OA

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Sandy
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Director
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Joined: 20 Apr 2016
Posts: 758
Followers: 6

Kudos [?]: 514 [1] , given: 94

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Re: How many committees of 5 members can be chosen from a group [#permalink] New post 02 Dec 2017, 10:34
1
This post received
KUDOS
sandy wrote:
How many committees of 5 members can be chosen from a group of 8 people?

A. 28
B. 56
C. 118
D. 336
E. 6,720

Drill 1
Question: 10
Page: 523


We can use combination ie 8C5 = 56
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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1657 [0], given: 396

CAT Tests
Re: How many committees of 5 members can be chosen from a group [#permalink] New post 10 Dec 2017, 17:12
Expert's post
Explanation

This is the number of combinations of 8 items taken 5 at a time (because the order does not matter). This number is equal to \(\frac{8}{5}\times\frac{7}{4}\times\frac{6}{3}\times\frac{5}{2}\times\frac{4}{1}=8\times7=56\).

Hence option B is correct!
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Sandy
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Re: How many committees of 5 members can be chosen from a group   [#permalink] 10 Dec 2017, 17:12
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