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A researcher plans to identify each participant in a certain

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Director
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Joined: 08 Jul 2004
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A researcher plans to identify each participant in a certain [#permalink]

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New post 05 Apr 2005, 15:17
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

57% (01:09) correct 43% (01:16) wrong based on 260 sessions

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A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

A. 4
B. 5
C. 6
D. 7
E. 8

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-researcher-plans-to-identify-each-participant-in-a-certain-134584.html
[Reveal] Spoiler: OA

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Regards, S

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Manager
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Re: PS combinations [#permalink]

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New post 05 Apr 2005, 20:31
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saurya_s wrote:
A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?
A. 4
B. 5
C. 6
D. 7
E. 8


Ans = B (5)

Use A, B, C,D& E as the 5 codes.
5 participants can each get one of the 5 codes.
For the remaining, use 2 code combinations from the 5 codes
10 such combinations are possible.
Hence 5 codes are suff.

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New post 06 Apr 2005, 03:48
ssap is right. B:5
A B C D E and the first 5 are done
AB AC AD AE
BC BD BE
CD CE
DE
(no more than 4!)

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Director
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New post 06 Apr 2005, 04:56
Agree with 5.
Set of answers provided above explains perfectly why 6 is overestimated.

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Director
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Re: A researcher plans to identify each participant in a certain [#permalink]

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New post 30 Dec 2012, 03:01
How to solve this one?
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Click +1 Kudos if my post helped...

Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/

GMAT Prep software What if scenarios http://gmatclub.com/forum/gmat-prep-software-analysis-and-what-if-scenarios-146146.html

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Re: A researcher plans to identify each participant in a certain [#permalink]

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New post 30 Dec 2012, 07:42

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Re: A researcher plans to identify each participant in a certain   [#permalink] 30 Dec 2012, 07:42
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