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A researcher plans to identify each participant in a certain

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Director
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A researcher plans to identify each participant in a certain [#permalink] New post 05 Apr 2005, 14:17
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A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

54% (02:09) correct 46% (01:20) wrong based on 105 sessions
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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Re: PS combinations [#permalink] New post 05 Apr 2005, 19:31
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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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 [#permalink] New post 06 Apr 2005, 02:48
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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 [#permalink] New post 06 Apr 2005, 03:56
Agree with 5.
Set of answers provided above explains perfectly why 6 is overestimated.
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Re: A researcher plans to identify each participant in a certain [#permalink] New post 30 Dec 2012, 02:01
How to solve this one?
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Re: A researcher plans to identify each participant in a certain [#permalink] New post 30 Dec 2012, 06:42
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Re: A researcher plans to identify each participant in a certain   [#permalink] 30 Dec 2012, 06:42
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