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# If a code word is defined to be a sequence of different

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Manager
Joined: 03 Oct 2008
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If a code word is defined to be a sequence of different [#permalink]

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07 Oct 2008, 07:08
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?

A. 5 to 4
B. 3 to 2
C. 2 to 1
D. 5 to 1
E. 6 to 1
Senior Manager
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07 Oct 2008, 07:12
albany09 wrote:
If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?

A. 5 to 4
B. 3 to 2
C. 2 to 1
D. 5 to 1
E. 6 to 1

5 letter code is 10P5 so 10*9*8*7*6
4 letter code is 10P4 so 10*9*8*7

ratio is 5 letter code over 4 letter so thats 6 over 1
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Re: math ---code   [#permalink] 07 Oct 2008, 07:12
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