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# A researcher plans to identify each participant in a certain

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Intern
Joined: 15 Feb 2018
Posts: 3
Re: A researcher plans to identify each participant in a certain  [#permalink]

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06 Nov 2018, 09:07
Bunuel
so effectively we have used 4 letters.
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Joined: 02 Sep 2009
Posts: 52119
Re: A researcher plans to identify each participant in a certain  [#permalink]

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06 Nov 2018, 09:11
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sacmenon wrote:
Bunuel
so effectively we have used 4 letters.

Please read the question carefully: a code consists of either a single letter or a pair of distinct letters written in alphabetical order.
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Re: A researcher plans to identify each participant in a certain  [#permalink]

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26 Dec 2018, 09:19
Hello Bunuel,

I find a similarity with another problem you have solved. The problem link as below:

https://gmatclub.com/forum/a-company-that-ships-boxes-to-a-total-of-12-distribution-centers-uses-168427.html

A point to note in that reference question is that the condition is for two different colors where the order does not matter (Thereby, we have the denominator 2!). Similarly, in this question, we have "a pair of distinct letters written in alphabetical order" which I think means is to introduce the denominator 2! just as in the other question. Is my thinking right?
Re: A researcher plans to identify each participant in a certain &nbs [#permalink] 26 Dec 2018, 09:19

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