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# A cryptographer has intercepted an enemy message that is in code. He k

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Math Expert
Joined: 02 Sep 2009
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A cryptographer has intercepted an enemy message that is in code. He k  [#permalink]

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03 Aug 2019, 23:11
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Difficulty:

75% (hard)

Question Stats:

41% (01:27) correct 59% (01:27) wrong based on 73 sessions

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A cryptographer has intercepted an enemy message that is in code. He knows that the code is a simple substitution of numbers for letters.

Which of the following would be the least helpful in breaking the code?

(A) Knowing the frequency with which the vowels of the language are used
(B) Knowing the frequency with which two vowels appear together in the language
(C) Knowing the frequency with which odd numbers appear relative to even numbers in the message
(D) Knowing the conjugation of the verb to be in the language on which the code is based
(E) Knowing every word in the language that begins with the letter R

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Re: A cryptographer has intercepted an enemy message that is in code. He k  [#permalink]

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05 Aug 2019, 05:22
Can someone kindly provide the reasoning?
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Re: A cryptographer has intercepted an enemy message that is in code. He k  [#permalink]

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05 Aug 2019, 06:05
Because the message is coded in numbers, C does not give the operator any more information than he can already access. Is that it?
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Re: A cryptographer has intercepted an enemy message that is in code. He k  [#permalink]

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09 Jan 2020, 09:58
Official Explanation

To break the code, the cryptographer needs information about the language that the code conceals.

(A), (B), (D), and (E) all provide such information. (C), however, says nothing about the underlying language. The code could even use all even or all odd numbers for the symbol substitutions without affecting the information to be encoded.

Hope it helps
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Re: A cryptographer has intercepted an enemy message that is in code. He k   [#permalink] 09 Jan 2020, 09:58