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# 21 people of which 12 are experienced. select a team of 3 so

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Intern
Joined: 29 Apr 2013
Posts: 11

Kudos [?]: 2 [0], given: 5

21 people of which 12 are experienced. select a team of 3 so [#permalink]

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18 Sep 2013, 08:44
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Question Stats:

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21 people of which 12 are experienced. select a team of 3 so that

a) At least 1 is experienced
b) Exactly 1 is experienced

This is a PS question...

Kudos [?]: 2 [0], given: 5

Manager
Joined: 18 Sep 2013
Posts: 54

Kudos [?]: 20 [2], given: 8

Location: India
Concentration: General Management, Strategy
GMAT 1: 680 Q46 V36
GPA: 3.95
WE: Information Technology (Computer Software)
Re: 21 people of which 12 are experienced. select a team of 3 so [#permalink]

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18 Sep 2013, 09:01
2
KUDOS
1
This post was
BOOKMARKED
aman kumar wrote:
21 people of which 12 are experienced. select a team of 3 so that

a) At least 1 is experienced
b) Exactly 1 is experienced

This is a PS question...

1. Exactly 1 is experienced
Total no of ways to select 1 person with experience - 12.
Total no of ways to select remaining 2 persons - 9C2.

hence total ways - 12 x 9C2 = 432.

2. Atleast 1 is experienced
(1E)(2NE) + (2E)(1NE) + 3E
12(9c2) + (12c2)9 + 12c3

Please press KUDOS if my post helped !!

Kudos [?]: 20 [2], given: 8

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16681

Kudos [?]: 273 [0], given: 0

Re: 21 people of which 12 are experienced. select a team of 3 so [#permalink]

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10 Apr 2016, 08:29
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Kudos [?]: 273 [0], given: 0

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16681

Kudos [?]: 273 [0], given: 0

Re: 21 people of which 12 are experienced. select a team of 3 so [#permalink]

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07 Aug 2017, 07:52
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 273 [0], given: 0

Re: 21 people of which 12 are experienced. select a team of 3 so   [#permalink] 07 Aug 2017, 07:52
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