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DS - First Timer

This topic has 2 expert replies and 1 member reply
Valerieangelkos Newbie | Next Rank: 10 Posts
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Posted:
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DS - First Timer

Post Wed May 15, 2013 5:04 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,
    I have a question regarding DS questions.
    If the choice, either (1) or (2), gives an answer to a specific question, being YES or NO, should I choose it because it gives a specific answer, or because the answer it gives is YES?

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    Post Wed May 15, 2013 5:17 pm
    I'm not 100% sure I understand your question.

    Everything comes down to whether or not a statement provides enough information to answer a target question with absolute certainty.

    So, for example, if the target question is a YES/NO question, as in "Is k a prime number?", then we need to determine whether or not a statement provides enough information to state either "yes, k is definitely a prime number or "no, k is definitely not a prime number." If we can definitively answer the question (either yes or no), then the statement is sufficient.

    If the target question is a VALUE question, as in "What is the value of k?", then we need to determine whether or not a statement provides enough information to state "the value of k must be ...... " If we can do this, then the statement is sufficient.

    For more information about this, you might want to watch our free video that covers this particular question: http://www.gmatprepnow.com/module/gmat-data-sufficiency?id=1098

    Cheers,
    Brent

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    fcabanski Master | Next Rank: 500 Posts
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    Post Fri May 17, 2013 8:13 am
    The statement is sufficient if it answers the question. If the question is a yes/no question, and the statement lets you know the answer is no, then the statement is sufficient.

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    Post Fri May 17, 2013 8:38 am
    A definitive YES or a definitive NO answer would each be sufficient. Only an answer of MAYBE (or "sometimes yes, sometimes no") would be insufficient.

    However, "definitive NO is sufficient" is not a rule that the GMAT tests regularly. For most YES/NO questions, a statement that gives sufficient information will give a "yes" answer to the question.

    Out of the DS problems in OG13 and the Quant Supplement 2nd Ed, only 1 that I can find has statements that give a definitive "no" answer:

    Quote:
    DS #136 OG13
    If @ represents one of the operations +, -, and x , is k @ (L + m) = (k @ L) + (k @ m) for all numbers k, L , and m ?

    (1) k @ 1 is not equal to 1 @ k for some numbers k.

    (2) @ represents subtraction.
    (The actual problem used a circle, not an @ symbol, but I don't know how to recreate that here!)

    We can rephrase the question as "does the operation @ represent multiplication?" as multiplication is the only operation for which k @ (L + m) = (k @ L) + (k @ m)

    (1) k @ 1 is not equal to 1 @ k for some numbers k.

    If these two are not equal, then @ must NOT represent multiplication, because k*1 = 1*k. Therefore, the answer to the question "is @ multiplication?" is "no, definitely not." Sufficient.

    (2) @ represents subtraction.

    Again, the answer to the question "is @ multiplication?" is "no, definitely not." Sufficient.

    The answer is D.

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