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    Strategies and techniques for approaching featured GMAT topics

Groups P, Q, and R have 20 persons each, while group S has 10 persons.

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Joined: 02 Sep 2009
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Groups P, Q, and R have 20 persons each, while group S has 10 persons.  [#permalink]

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New post 02 Oct 2018, 00:54
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E

Difficulty:

  25% (medium)

Question Stats:

83% (01:40) correct 17% (01:46) wrong based on 41 sessions

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Groups P, Q, and R have 20 persons each, while group S has 10 persons. Groups P, Q, R, and S have no persons in common. A task force is to be formed by selecting one person from each of groups P, Q, and R and two persons from group S. How many different task forces are possible?

(A) 72,000
(B) 152,000
(C) 200,000
(D) 240,000
(E) 360,000

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Joined: 06 Nov 2014
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Re: Groups P, Q, and R have 20 persons each, while group S has 10 persons.  [#permalink]

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New post 02 Oct 2018, 01:08
A combinatoric problem.

There are 20 options to select a person from group P
There are 20 options to select a person from group Q
There are 20 options to select a person from group R
There are 10!/(2!*8!) = (9*10)/2 options to select a person from group S

Total number of possible task forces
= 20*20*20*9*10/2
= 10*20*20*90
= 360,000
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Re: Groups P, Q, and R have 20 persons each, while group S has 10 persons.  [#permalink]

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New post 02 Oct 2018, 01:39
1
Applying combinations- ways of choosing y from x

P*Q*R*S= 20C1*20C1*20C1*10C2= 20*20*20*45 = 360,000 (E)
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Re: Groups P, Q, and R have 20 persons each, while group S has 10 persons. &nbs [#permalink] 02 Oct 2018, 01:39
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Groups P, Q, and R have 20 persons each, while group S has 10 persons.

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