Search found 15 matches
Thanks, this is really useful. So, for 2 overlapping groups, it would be:GMATGuruNY wrote: Here is the formula for 3 overlapping groups:
T = A + B + C - (AB + AC + BC) - 2(ABC)
T = A + B - AB ?
- by talueng
Sun Nov 18, 2012 4:49 am- Forum: Problem Solving
- Topic: OG 13 #178 - Virtual Reality
- Replies: 22
- Views: 15101
Just want to emphasize that you should memorize the basic factoring rules such as (helpful in this example): a²-b² = (a+b)(a-b) Remembering (and being able to apply) these rules is not only handy (as it helps to reduce time spend and errors); I would even say they are essential for some questions....
- by talueng
Sun Nov 18, 2012 2:25 am- Forum: Problem Solving
- Topic: if a>b>0, then sqrt a^2 + b^2
- Replies: 8
- Views: 15602
What are the most common issues to watch out for in SC?
Please add your thoughts!
1. Grammatical errors
a) Subject Verb Agreement: Singular goes with singular, plural goes with plural, lists of singulars are plural
b) Parallelism
c) ...
2. Meaning (if still no matching answer found)
3. Conciseness (if still no matching answer found)
- by talueng
Sun Nov 18, 2012 2:15 am- Forum: Sentence Correction
- Topic: What are the most common issues to watch out for in SC?
- Replies: 2
- Views: 1100
A related questions: In the actual exam, are numbering and time display the same as in GMATPrep, i.e. are the numbers showed as "n of total" and the time is running from total to 0? If so, the numbering scheme here, though in general useful, doesn't make sense for me, because the left colu...
- by talueng
Sun Nov 18, 2012 2:11 am- Forum: Ask the Test Maker
- Topic: Organizing your scratch board on test day
- Replies: 17
- Views: 5628
Question type "Sets" (eg. OG13, no. 178)
OG13, p.177, no. 178: Of the 300 subjects who participated in an experiment [...], 40 percent experience sweaty palms, 30 percent experienced vomiting, and 75 percent experienced dizziness. If all of the subjects experienced at least one of these effects and 35 percent of the subjects experienced e...
- by talueng
Wed Nov 14, 2012 9:19 pm- Forum: Problem Solving
- Topic: Question type "Sets" (eg. OG13, no. 178)
- Replies: 3
- Views: 1283
Given that we can ask for as many scratch boards as we want, do we really need to bother about how many questions per page etc? Is that confirmed? So I can ask for say 5 scratch boards? Or would I have to request a new scratch board every time I am running out of pages (which would cost valuable ti...
- by talueng
Wed Nov 14, 2012 9:11 pm- Forum: Ask the Test Maker
- Topic: Organizing your scratch board on test day
- Replies: 17
- Views: 5628
Thanks!
As for 3., my question is how the statistical measures are affected when changing the sample, for example:
- Changing the size of the sample by adding or removing an object to/from the sample
- Transforming one or n objects from the sample (by adding/subtracting/multiplying)
- by talueng
Wed Nov 14, 2012 9:07 pm- Forum: Problem Solving
- Topic: How do mean/median/mode/std.dev. change?
- Replies: 2
- Views: 16458
GMATPrep Practice Exam: Combinations
A 4-person task force is to be formed from the 4 men and 3 women who work in Company G's human resources department. If there are to be 2 men and 2 women on this task force, how many different task forces can be formed? a. 14 b. 18 c. 35 d. 56 e. 144 My answer would be that n = 4*3*3*2, but 72 does ...
- by talueng
Tue Nov 13, 2012 1:46 am- Forum: Data Sufficiency
- Topic: GMATPrep Practice Exam: Combinations
- Replies: 2
- Views: 968
I am opening this again because the replies above don't satisfy me. Can someone please elaborate the difference between a premise and an assumption? Is it correct to say that a premise can be (but not necessarily has to be) an assumption made? For instance, in: "Since all men are mortal and Soc...
- by talueng
Mon Nov 12, 2012 4:49 am- Forum: GMAT Verbal & Essays
- Topic: Analysis of Argument - Template - Premise or Assumption?
- Replies: 5
- Views: 29120
How do mean/median/mode/std.dev. change?
I'm creating a cheat sheet for statistical measures. Please help making it complete: How does ... effect mean, median, mode, range, and std. dev.? 1) Add constant: Add same constant to mean, median, mode; range and std. dev. not affected. 2) Multiply with constant: Multiply mean, median, mode, range...
- by talueng
Sun Nov 11, 2012 11:59 pm- Forum: Problem Solving
- Topic: How do mean/median/mode/std.dev. change?
- Replies: 2
- Views: 16458
(0) Fraction = Shaded Area / Square Area (1) Square Area: The area of a square is the product of it's sides, thus: Square Area = (x+w)² (2) Shaded Area = Square Area - White Parts (2a) White Parts = Sum of the 4 Triangle Areas = 0.5xw + 0.5xw + 0.5w2w + 0.5xy = xw + w² + 0.5xy (2b) Shaded Area = S...
- by talueng
Sun Nov 11, 2012 4:32 am- Forum: Problem Solving
- Topic: Difficult Math Question #11
- Replies: 4
- Views: 3790
Divisibility Rules This is very basic primary school knowledge but can be very handy for certain questions. The simple rules help to identify whether a (potentially very large) integer can be divided (ie. divided with a remainder of 0) by 2, 3, etc.: The technique Rather than having to actually div...
- by talueng
Sat Nov 10, 2012 10:47 am- Forum: GMAT Strategy
- Topic: Share your best tricks/workarounds/techniques
- Replies: 3
- Views: 1103
Are OG prep questions ordered by difficulty?
Are the questions in the OG ordered by difficulty from easy to hard?
- by talueng
Sat Nov 10, 2012 1:35 am- Forum: Ask the Test Maker
- Topic: Are OG prep questions ordered by difficulty?
- Replies: 2
- Views: 1831
Share your best tricks/workarounds/techniques
(I hope a similar topic doesn't exist yet, otherwise please merge it.) I recently found a technique how to tackle Data Sufficiency questions which helped me to boost my score in that area. I am looking for more such techniques, tricks, and workarounds for specific question types (or whole areas) and...
- by talueng
Fri Nov 09, 2012 9:27 am- Forum: GMAT Strategy
- Topic: Share your best tricks/workarounds/techniques
- Replies: 3
- Views: 1103
General GMAT questions (score, process, etc.)
I hope this is the correct forum to post in for some general questions regarding the GMAT that popped up while studying: 1. GMAT score: 1a. IR and AWA Importance : In the official GMAT book it is said that the GMAT score consists of only the Verbal and the Numerical parts, not the IR and AWA. Is tha...
- by talueng
Fri Nov 09, 2012 4:02 am- Forum: GMAT Strategy
- Topic: General GMAT questions (score, process, etc.)
- Replies: 2
- Views: 1206