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Are there exactly 3 distinct symbols used to create the code

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Are there exactly 3 distinct symbols used to create the code [#permalink] New post 07 Apr 2006, 19:27
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Are there 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 horizonal arrangements of one or mroe symbols, with no repetition.

2) There are exactly 15 code words in language Q.
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 [#permalink] New post 07 Apr 2006, 21:46
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St1. Does not tell us how many code were are there but tells us that they are all distinct

st2. tells us there are 15 code words

Combining the statements we know there are 15 distinct codes therefore question is answered.
  [#permalink] 07 Apr 2006, 21:46
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Are there exactly 3 distinct symbols used to create the code

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