It is currently 21 Sep 2017, 10:53

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A researcher plans to identify each participant in a certain

Author Message
TAGS:

### Hide Tags

Director
Joined: 08 Jul 2004
Posts: 596

Kudos [?]: 266 [0], given: 0

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

### Show Tags

05 Apr 2005, 15:17
00:00

Difficulty:

45% (medium)

Question Stats:

58% (01:09) correct 42% (01:16) wrong based on 254 sessions

### HideShow timer Statistics

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

_________________

Regards, S

Kudos [?]: 266 [0], given: 0

Manager
Joined: 04 Mar 2005
Posts: 106

Kudos [?]: 4 [2], given: 0

Location: NYC

### Show Tags

05 Apr 2005, 20:31
2
KUDOS
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.

Kudos [?]: 4 [2], given: 0

Senior Manager
Joined: 19 Feb 2005
Posts: 486

Kudos [?]: 25 [0], given: 0

Location: Milan Italy

### Show Tags

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

Kudos [?]: 25 [0], given: 0

Director
Joined: 31 Aug 2004
Posts: 606

Kudos [?]: 146 [0], given: 0

### Show Tags

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

Kudos [?]: 146 [0], given: 0

Director
Joined: 29 Nov 2012
Posts: 877

Kudos [?]: 1358 [0], given: 543

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

### Show Tags

30 Dec 2012, 03:01
How to solve this one?
_________________

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

Kudos [?]: 1358 [0], given: 543

Math Expert
Joined: 02 Sep 2009
Posts: 41660

Kudos [?]: 124319 [0], given: 12077

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

### Show Tags

30 Dec 2012, 07:42
fozzzy wrote:
How to solve this one?

Check here: a-researcher-plans-to-identify-each-participant-in-a-certain-134584.html
_________________

Kudos [?]: 124319 [0], given: 12077

Re: A researcher plans to identify each participant in a certain   [#permalink] 30 Dec 2012, 07:42
Similar topics Replies Last post
Similar
Topics:
8 In a certain learning experiment, each participant had three trials an 7 10 Sep 2017, 03:12
26 A certain research group plans to create computer models of 20 23 Nov 2016, 06:16
3 If each of the 12 teams participating in a certain tournament plays 2 22 Jul 2017, 02:49
15 Each participant in a certain study was assigned a sequence 7 27 May 2017, 06:43
235 A researcher plans to identify each participant in a certain 90 03 Sep 2017, 11:27
Display posts from previous: Sort by

# A researcher plans to identify each participant in a certain

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.