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  1. Replies
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    10,966

    Re: Difficult Permutation Problem

    If the order of the individual seat locations matters, then you are correct: the answer is 12!

    Note that this number can also be derived as follows:

    # of Groups of 7 (and 5 left over) that can...
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    4,725

    Let A denote the number of Albs Let B denote the...

    Let A denote the number of Albs
    Let B denote the number of Berks
    Let t denote the number of ticks
    Let c denote the number of clicks

    From the given portion of the question, we know the...
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    3,212

    I'm guessing that "first" should say "lowest".

    I'm guessing that "first" should say "lowest".
  4. Replies
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    28,699

    This is a different interpretation than I had for...

    This is a different interpretation than I had for the problem. To me, what you're doing is keeping the order of the consonants the same...NOT the positions.
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    Probably because the "!" is missing.

    Probably because the "!" is missing.
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    28,699

    1,000,001 1,000,010 1,000,100 1,001,000...

    1,000,001
    1,000,010
    1,000,100
    1,001,000
    1,010,000
    1,100,000
    2,000,000

    Answer is B
  7. Replies
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    Since the question has made no mention of which...

    Since the question has made no mention of which types of tables these are (ie. a round table will have a different number of distinct seating arrangements than a rectangular one) or the order of how...
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    3,210

    Both of your observations are correct, assuming...

    Both of your observations are correct, assuming that you haven't overlooked any restrictions included in the original problems. :)
  9. Replies
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    The so-called "official answers" are not...

    The so-called "official answers" are not reliable...

    QUESTION 1

    Column A
    There are 13 distinct ranks in a standard deck of cards (assuming all jokers removed, etc). When we remove the queens,...
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    1,133

    Nicely done, Tom.

    Nicely done, Tom.
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    1,133

    Postman, you may want to look over how to...

    Postman, you may want to look over how to properly solve quadratic equations. Remember that they must always have a "0" on the right-hand-side...


    x^2 - 5x - 1 = 0
    x = 5 +/- sqrt[(25+4)/2]
    ...
  12. Tom, sorry to say it but you missed the mark...

    Tom, sorry to say it but you missed the mark twice.


    Question 1

    M2 is, indeed, 4/3, but you forgot to calculate |1-M2|, which equals 1/3, when evaluating the case for X = 0. Since 1 > 1/3,...
  13. Like question 1, question 2 requires little...

    Like question 1, question 2 requires little calculation to be solved (as is often the case with GRE stats questions)...

    The question tells us that n is in between m and p and that it is less than...
  14. Without doing much math at all, we can solve the...

    Without doing much math at all, we can solve the first problem pretty easily I think...

    Question 1

    Remember that standard deviation is a measure of how much the values in a group are spread...
  15. Thread: DS problem...

    by krusta80
    Replies
    3
    Views
    911

    Tom, you need to be careful! This problem boils...

    Tom, you need to be careful! This problem boils down to the classic trick...

    sqrt(x^2) ONLY EQUALS x when x >= 0

    In other words, squaring a number and then square rooting it is the same as...
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