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# PS GMAT prep combinations

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Manager
Joined: 19 Oct 2008
Posts: 87

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26 Mar 2009, 10:56
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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

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Senior Manager
Joined: 16 Jan 2009
Posts: 345
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Re: PS GMAT prep combinations [#permalink]

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26 Mar 2009, 12:36
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.
_________________

Lahoosaher

Manager
Joined: 19 Oct 2008
Posts: 87
Re: PS GMAT prep combinations [#permalink]

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26 Mar 2009, 14:17
My mistake in typing:

There are 12 people with previous experience in space flight.

VP
Joined: 28 Dec 2005
Posts: 1487
Re: PS GMAT prep combinations [#permalink]

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26 Mar 2009, 19:14
So then it should be 432, right ? (12C1)*(9C2) ?
Senior Manager
Joined: 16 Jan 2009
Posts: 345
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Re: PS GMAT prep combinations [#permalink]

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27 Mar 2009, 03:10
=(12C1)*(9C2)

_________________

Lahoosaher

Manager
Joined: 19 Aug 2006
Posts: 226
Re: PS GMAT prep combinations [#permalink]

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27 Mar 2009, 21:40
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.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: PS GMAT prep combinations   [#permalink] 27 Mar 2009, 21:40
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