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drawing possibility..

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ska7945 Really wants to Beat The GMAT! Default Avatar
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drawing possibility.. Post Mon Aug 11, 2008 5:30 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    6)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


    explanation needed thx.

    answer E

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    kris610 Really wants to Beat The GMAT! Default Avatar
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    Post Mon Aug 11, 2008 5:44 pm
    If you are not familiar with Combinatorics:

    The first letter may be selected in 10 ways. For each of the 10 possible ways, you may choose the second letter in 9 possible ways and so on.

    So, the required ratio would be:

    10*9*8*7*6:10*9*8*7, which would be 6:1

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