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# Are exactly 3 distinct symbols used to create the code words

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Director
Joined: 23 May 2008
Posts: 807
Are exactly 3 distinct symbols used to create the code words [#permalink]

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06 Oct 2008, 22:09
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Are exactly 3 distinct symbols used to create the code words in language Q?

1) The set of all code words in language Q is the set of all possible distinct horizontal arrangements of one or more symbols, with no repetition

2) There are exactly 15 code words in language Q
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Joined: 17 Jun 2008
Posts: 1548

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06 Oct 2008, 23:30
C.

If a, b and c are three different symbols then 15 different code words can be made using these three symbols as follows:

3P1 + 3P2 + 3P3 = 15
Re: DS: veritas prep   [#permalink] 06 Oct 2008, 23:30
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