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# PS GMAT prep combinations

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Manager
Joined: 19 Oct 2008
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PS GMAT prep combinations [#permalink]  26 Mar 2009, 09:56
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From a group of 21 astronauts that includes people with previous experience in space flight, a 3 person crew is to be selected so that exactly 1 person in the crew has previous experience in flight. How many different crews are possible.

A) 432
B) 594
C) 864
D) 1,330
E) 7,982
Senior Manager
Joined: 16 Jan 2009
Posts: 361
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Followers: 3

Kudos [?]: 89 [0], given: 16

Re: PS GMAT prep combinations [#permalink]  26 Mar 2009, 11:36
dont you think this question is incorrect , no information has been provided regarding th people with previous experience in space flight.

forgive me if i have missed anything.
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Lahoosaher

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Re: PS GMAT prep combinations [#permalink]  26 Mar 2009, 13:17
My mistake in typing:

There are 12 people with previous experience in space flight.

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Re: PS GMAT prep combinations [#permalink]  26 Mar 2009, 18:14
So then it should be 432, right ? (12C1)*(9C2) ?
Senior Manager
Joined: 16 Jan 2009
Posts: 361
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Followers: 3

Kudos [?]: 89 [0], given: 16

Re: PS GMAT prep combinations [#permalink]  27 Mar 2009, 02:10
=(12C1)*(9C2)

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Lahoosaher

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Re: PS GMAT prep combinations [#permalink]  27 Mar 2009, 20:40
Accountant wrote:
From a group of 21 astronauts that includes people with previous experience in space flight, a 3 person crew is to be selected so that exactly 1 person in the crew has previous experience in flight. How many different crews are possible.

A) 432
B) 594
C) 864
D) 1,330
E) 7,982

It should be A.

9!/7!2! * 12!/11!= 432.
Re: PS GMAT prep combinations   [#permalink] 27 Mar 2009, 20:40
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