Lesson: The Table Method

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vishalshrm539's picture

In the x<x^2 question, can we take x=1..?
gmat-admin's picture

You bet!
When we plug in x = 1, the answer to the target question is "No, x is NOT less than x^2"

vishalshrm539's picture

Ok..thank you sir

Hello guys
I think there is a mistake in the exercise done at 3:30 on this video, when is said divided, he is actually doing subtraction.
Sorry to bother
Best
gmat-admin's picture

Thanks for that, but "division" is correct here. 5 divided by 3 equals 1 with remainder 2.

Hi Brent,
I would like to ask based on your experience if I could take CAT each Week or it would not reflect any changes in my progress.
gmat-admin's picture

If you've already reviewed all of the GMAT content, then taking regular practice tests (CAT's) is a great idea. This will help build your test-taking skills AND help identify any remaining area(s) of weakness.

While CAREFULLY analyzing your practice tests, there are four main types of weakness to watch out for:
1. specific Quant skills/concepts (e.g., algebra, standard deviation, etc.)
2. specific Verbal skills/concepts (e.g., verb tenses, assumption CR questions, etc.)
3. test-taking skills (time management, endurance, anxiety etc.)
4. silly mistakes

For the first two weaknesses, the fix is pretty straightforward. Learn the concept/skill and find some practice questions to strengthen that weakness.

If your test-taking skills are holding you back, then you need to work on these. Be sure to review out time management video at http://www.gmatprepnow.com/module/general-gmat-strategies/video/1244

Finally, if silly mistakes are hurting your score, then it's important that you identify and categorize these mistakes so that, during tests, you can easily spot situations in which you're prone to making errors. I write about this and other strategies in the following article: http://www.gmatprepnow.com/articles/avoiding-silly-misteaks-gmat

Cheers,
Brent

Hey Brent,

Just getting started on these videos so maybe this will be come more clear in time, but I'm having trouble understanding sufficient/insufficient.

For example, the question at 4:25 and the statement x is positive. Doesn't this statement provide sufficient information to definitively answer "Is x < x^2?". When x = 2 we can definitively answer the question, yes, x < x^2. When x = .5 we can definitively answer the question, no, x < x^2.

If I'm remembering correctly from the previous video, we don't want to fall into the trap of answering the target question. We only want to answer whether the statement is sufficient to answer the target question. In this case, wouldn't the statement be sufficient to answer the question?

I guess I'm having trouble determining what qualifies as sufficient to answer the target question and what's just answering the target question.

Thanks,

Alex
gmat-admin's picture

Good question, Alex.

Data Sufficiency questions can seem very strange at first. The important thing is to keep asking yourself "Does this statement provide enough information to definitively answer the target question?"

Here, the target question asks "Is x < x²?"
This is a YES/NO question, so a statement will be considered sufficient if we can definitively answer in one of the two following ways:

- YES, x IS less than x²
- NO, x is NOT less than x²

When we test two possible values of x (x = 2 and x = 0.5), we get different answers to the target question.

In the first case (x = 2), the answer is "YES, x IS less than x²"
In the second case (x = 0.5), the answer is "NO, x is NOT less than x²"

So, which is it? Is or isn't x less than x²?

We can't say for certain. So, that statement is not sufficient.

Does that help?

Cheers,
Brent

yup, very helpful. Thanks!

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