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perm or comb? ps

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Director
Director
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Joined: 17 Oct 2005
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perm or comb? ps [#permalink] New post 18 Jan 2006, 10:20
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:41) correct 0% (00:00) wrong based on 0 sessions
There are 3 employees in a certain small company. How many ways can they shake hands with each other?
Director
Director
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Joined: 17 Dec 2005
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Location: Germany
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 [#permalink] New post 18 Jan 2006, 10:38
Hey Joe

it's a Combinations problem

3C2=3

In how many ways can thre employes shake 2 hands.
Director
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 [#permalink] New post 18 Jan 2006, 11:23
thanks allabout,

oa is 3
Senior Manager
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 [#permalink] New post 18 Jan 2006, 13:31
Yep this is easy C(3,2) = 3 (A shake hand with B or B with A are same so combination...)
CEO
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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 [#permalink] New post 18 Jan 2006, 16:06
I did this way.

Total Number of ways = 3 * 3 - 3(One can not shake hand with himself) = 6

Now divide it by two because A shaking hand with B and B shaking with A is same.

So final = 6/2 = 3
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

  [#permalink] 18 Jan 2006, 16:06
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