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

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VP
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If a code word is defined to be a sequence of different [#permalink] New post 01 Jun 2008, 12:22
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A
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C
D
E

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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: PS- letters [#permalink] New post 01 Jun 2008, 20:57
gmatnub wrote:
Can the letters be repeated?

a sequence of different letters
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Re: PS- letters [#permalink] New post 01 Jun 2008, 22:43
goalsnr 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


Total number of 5 letter code words would be 10*9*8*7*6
and total no of 4 letter words would be 10*9*8*7
hence the ratio is 6:1
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Re: PS- letters [#permalink] New post 02 Jun 2008, 18:20
gmatnub wrote:
Can the letters be repeated?


I think letters can be repeated but each code must be unique
Re: PS- letters   [#permalink] 02 Jun 2008, 18:20
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