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

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If a code word is defined to be a sequence of different [#permalink] New post 07 Oct 2008, 06:08
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
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Re: math ---code [#permalink] New post 07 Oct 2008, 06:12
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, 06:12
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