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Math Revolution GMAT Instructor V
Joined: 16 Aug 2015
Posts: 9138
GMAT 1: 760 Q51 V42
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Re: Overview of GMAT Math Question Types and Patterns on the GMAT  [#permalink]

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1
Senthil7 wrote:
MathRevolution,
.
I had read in certain external forums that people from a certain demography memorize as many quant problems they can and their sole intent is to do this when writing the GMAT and they return with most of the questions memorized. Is that how you declare that these are the questions or type of questions you see on GMAT?
.
Your threads leads me to think as if you know what will and will not be tested on GMAT whereas the threads by test takers suggest otherwise. Can you clarify?

Hi Senthil7,

We receive similar questions like yours once in a while.

- Max Lee has been giving lectures on GMAT Math over 16 years. He studied around 100,000 questions and personally took GMAT 27 times. Based on his experiences, he is very well aware of the current type of GMAT and so as the questions we post.

- In addition, since Max Lee studied math in under graduate and graduate school, he is able to grasp what is important and things given on GMAT from all parts of math. That is, there are many cases where logic considered important on GMAT Math is as same as logic considered in general math, which enables them to overlap.

- Furthermore, Max Lee analyses Official Guide every year from 2001 to 2017 and figures out the exact trend of questions and logic given on GMAT and how to solve them. This is how he comes up with the current type of questions. Official Guide is published by GMAC and they suggest questions be based on Official Guide. That is, if you analyse Official Guide
​, you can come up with the trend of similar or exact questions to GMAT.

- On top of that, he studied topology and chaos theory (Everything has a patter​n​), and possesses exceptional abilities to find consistent logic from complex and irregular questions of GMAT Math.

- His students give us feedback after an exam, and it is helpful for us to verify if the logic we come up with is correct.

- Math is internationally the same and a global universal language.

- Lastly, it took him nearly 10 years to come up with the logic. Some of our students hit 51, which makes us thrilled to see them. We are certain that our course based on the logic will be greatly helpful to boost ​the score of our students.

We appreciate your interest in our course.

Thank you.

Happy Studying!
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Math Revolution GMAT Instructor V
Joined: 16 Aug 2015
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GMAT 1: 760 Q51 V42
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This is a difficult 50-51 level ps question
(ex 5) (absolute value) What is the area of the region surrounded by |x|≤4 and |y|≤4 in the coordinate plane?
A. 24 B. 36 C. 48 D. 64 E. 72

Since, 8*8=64, the answer is D.
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Math Revolution GMAT Instructor V
Joined: 16 Aug 2015
Posts: 9138
GMAT 1: 760 Q51 V42
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Is a=b?
1) a≤b
2) b≤a
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Math Revolution GMAT Instructor V
Joined: 16 Aug 2015
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GMAT 1: 760 Q51 V42
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Re: Overview of GMAT Math Question Types and Patterns on the GMAT  [#permalink]

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Please remember that questions in the GMAT Math section are based on high school mathematics. You need a strong foundation in order to score high
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Math Revolution GMAT Instructor V
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1
As stated in the post, please master integer and statistics well! They include some key questions for GMAT Quant section
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Re: Overview of GMAT Math Question Types and Patterns on the GMAT  [#permalink]

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This is a superb thread keep up the great work!
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Joined: 07 Sep 2014
Posts: 332
Concentration: Finance, Marketing
Re: Overview of GMAT Math Question Types and Patterns on the GMAT  [#permalink]

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1
MathRevolution wrote:
Also, the highly advanced hidden integer questions frequently appear on exams.

(ex 6) Tom, who has 50 math questions, will get 5 points per question if he chooses a correct answer. If he chooses a wrong answer to a question or skips one, he will lose 2 points per question. Then, which of the following can be the score if he solves all the 50 questions?

A. 192
B. 193
C. 194
D. 195
E. 196

Maxmark 250
For every ques he loses 7. 7*7 =49.so 201 next 7 will be our ans from option so 194

Sent from my Moto G (4) using GMAT Club Forum mobile app
Math Revolution GMAT Instructor V
Joined: 16 Aug 2015
Posts: 9138
GMAT 1: 760 Q51 V42
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1
This is a 50-51 level question..
If (a^3)(b^4)(c^5)<0, is abc<0?
1) b>0
2) ab<0

If we modify the original condition and the question, the question becomes if ac<0, is abc<0?. Then, we get b>0?. Hence, the correct answer is A.
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Below is 50-51 level question.
What is the number of the different prime factors of n？
1) n is a factor of 3,600.
2) 90 is a factor of n.
There is 1 variable in the original condition. In order to match the number of variables and the number of equations, we need 1 equation. Hence, there is a high chance that D is the correct answer. Using 1) & 2), however, the correct answer is C.
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Math Revolution GMAT Instructor V
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Please study the table above as you further your study in the future
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I have only seen 2 matrix questions in GMAT Math so far. It seems as if Matrix questions are not asked in GMAT Math.
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There are some questions which combine both common mistake type 3 and 4. Below is a recent type of questions and is a 50-51 level common mistake type 4(B) question. You have to strong at this type of questions and have to understand the relationship between the Variable Appraoch method and the Common Mistake Type.

x+y=?
1) x^2 +|y|= 0
2) |x|+ y^2 =0
Both C and D can be answers, in this case. This is a common mistake type 4(B) question. The correct answer, in this case, is D.
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Below is related to absolute value. This is a high level question.
w+xy+z=?
1) z=147
2) w^2+x^2+y^2+z≤147
There are 4 variables in the original condition. Hence, there is a high chance that the correct answer is E. Using 1) and 2), we get z=147 and w=x=y=0. Hence, the condition is sufficient and the correct answer is C.
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Is x>0?
1) x2>x3
2) x3>x4

In case of inequality, if the range of question includes the range of condition, that condition becomes sufficient. Hence, we solve each question using inclusion relationship.
In case of condition 1), if we divide both sides by x^2, we get 1>x. The range of question does not include the range of condition. Hence, the condition is not sufficient.
In case of condition 2), if we divide both sides by x^2, we get x>x2 ==> 0<x<1. Hence, the correct answer is B. The range of the question includes the range of the condition.
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2) The question below is a 5051-level problem, and an inequality problem that ignores squared numbers
(ex 2) (inequality) If x and y are positive, is y/x > x/y?
1) y>x
2) y=x+2
==> If you change the original condition and the problem, since x and y are positive numbers, the sign of inequality does not change even if both sides are multiplied by xy. If so, in y/x>x/y?, y2-x2>0?, (y-x)(y+x)>0?, y+x>0, thus, y-x>0?, y>x?. In the case of 1) the answer is yes, and in the case of 2) y-x=2>0 yes, thus the answer is D.

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3) Let’s always be careful about the CMT 4(A) like the one below

(ex 3) (statistics) What is the standard deviation of 10 numbers?
1) The standard deviation of them is d, then d2-d=0
2) The product of all the 10 numbers is negative

==> In the original condition, the answer is highly likely to be E with 10 variables. If you go with 1) & 2) you get, from d(d-1)=0, you get d=0,1, and in the case of 2) in order for the mulplication of ten numbers to get negative number, there has to be at least one number that is different from each other. Thus, d≠0, and d=1, hence suffi. Therefore, the answer is C.
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1
If a and b are integers, is ab+1 an odd?
1) a is an even
2) b is an odd
==> In the original condition, C is likely to be the answer since there are 2 variables (a,b). If you solve 1) & 2), you actually get C as an answer. However, this problem, too, is a integer problem(a key question), and if you apply CMT 4(A), if you do 1), a=even, it becomes ab=even ab+1=even+1=odd, hence yes, and suffi. Therefore, the answer is A.
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CMT 4(B) still often comes out these days.

If a and b are prime numbers, what is the value of a+b?

1) 30≤a<b≤40
2) ab=1,147

==>In the original condition, the answer is highly likely to be C since there are 2 variables (a,b). If you do 1)&2), in the case of 1), you get a=31, b=37, hence unique, and suffi. In the case of 2),too, it becomes 31*37=1,147, therefore suffi. The answer is D. You must not forget about CMT 4(B) like this one with 1) easy and 2) difficult. If you can do A, B easily, consider D. Hence the answer is D.

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If x≠0, is x^2/|x|<1?
1) -1<x<1
2) 0<x

==>If you change the original condition and the problem, you get is x^2/|x|<1? --> is |x|^2/|x|<1? --> is |x|<1? --> -1<x<1?, so A is the answer.

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Below is the 5051 question.

Is x<xy<y?
1) x<y
2) 0<x<1<y

==> In the original condition, there are 2 variables (x,y), so C is highly likely to be the answer. Through 1) & 2), 2) is true, and from 2) x<1, both sides of the equation can be multiplied by y, and you get xy<y. From 1<y, you multiply both sides of the equation by x, you get x<xy, then you get x<xy<y, hence yes, and sufficient. B is the answer
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# Overview of GMAT Math Question Types and Patterns on the GMAT  