Questions tagged [gre-exam]
For questions relevant to the general or subject-specific Graduate Record Examination, abbreviated GRE.
435
questions
2
votes
4answers
211 views
GRE question - unintersection
I'm struggling to visualize the following GRE problem:
The solution says that for $m$ and $n$ to intersect on the right, it has to be the case that $2x+3x>180$, after that we get $x>36$. But I ...
0
votes
1answer
54 views
GRE Question regarding two quantities
These are sample questions
The question states this
w > 1
....Quantity A..............................Quantity B
7w - 4 .....
0
votes
1answer
84 views
GRE percentages / discount question
The following is a practice question from a GRE preparation book.
A case of $100$ candy bars is sold at a discount of $\$0.36$ per bar.
Quantity A: the discount per case
Quantity B: 36%
(a) A is ...
0
votes
1answer
119 views
Please explain the answer to this range based question?
The average weight of a set X of 100 bags of rice is 90 pounds , and the standard deviation is 8 pounds. Bag A weighs 2 standard deviations below the average weight and Bag B weighs 5 pounds more than ...
0
votes
1answer
597 views
profit and loss GRE question
I found this GMAT question on a forum, but couldn't find an answer nor do I understand it well.
An article costing C dollars is sold for \$100 at a loss of x percent of the selling price. It is then ...
1
vote
1answer
77 views
finding out percentiles from given data
I'm trying to improve my understanding of percentiles by just coming up with data of my own and analyzing it (as opposed to just mostly reading 'x' percentile means you performed better than x % of ...
2
votes
1answer
66 views
Follow up question from: If p and q are prime which elements are in the subgroup? (GRE question)
original question: If p and q are prime which elements are in the subgroup? (GRE question)
I would simply like to ask a follow up question since I don't quite fully understand why the correct answer ...
4
votes
1answer
207 views
Ideals of a ring
The GRE Practice book includes this problem (#50).
Let $R$ be a ring and let $U$ and $V$ be (two-sided) ideals of $R$. Which of the following must also be ideals of $R$ ?
I. $U + V = \{ u + v : u \in ...
1
vote
2answers
485 views
Complex Analysis Math GRE
So I came across this problem while studying for the Math GRE, and I was wondering what's a quick trick to solve this (like in the amount of time you have for a problem on the GRE subject test) :
If $...
0
votes
1answer
58 views
a bottle of laundry detergent costs $3.60. Each bottle can be used to wash 23 loads of laundry
Please!
A bottle of laundry detergent costs $3.60. Each bottle can be used to wash 23 loads of laundry.
$$Quantity\ A: \ $40 $$ $$\ Quantity\ B:$$
$$The\ approximate\ cost\ of\ the\ laundry\ ...
1
vote
0answers
64 views
Relation of function with its derivatives
Suppose that $f$ is twice-differentiable function on the set of real numbers and that $f(0), f'(0),$ and $f''(0)$ are all negative. Suppose that $f''$ has all three of the following properties:
I. It ...
1
vote
1answer
96 views
Open and Closed subspaces of Metric Space
The GRE Practice book includes this problem (#42).
Let $\mathbb{Z}^+$ be the set of positive integers, and $d$ be a metric defined on $\mathbb{Z}^+$ by:
$d(m, n) = \begin{cases}
0 & m=...
2
votes
1answer
290 views
How to improve GRE Math Subject score in a week?
I have a problem now: I need to improve about 15 points in the raw score in a week.
I have to take GRE Math Subject next week.
I have been reviewing for a week and I can get about 30/66 questions ...
1
vote
1answer
122 views
The probability that it is a woman, or a man who is not bringing a dessert?
John invites 12 friends to a dinner party, half of which are men. Exactly one man and one woman are bringing desserts. If one person from this group is selected at random, what is the probability that ...
1
vote
1answer
791 views
Linear algebra book GRE Math Subject
I am preparing for GRE Math Subject which I will take in October. Did anyone take this exam here? Please recommend some good book on abstract algebra and linear algebra. I can work out with matrices, ...
5
votes
2answers
855 views
What does the subject GRE measure?
I took the math subject GRE in 2010, two years before I got my bachelor's degree. I hadn't taken Complex Variables or Topology or even Linear Algebra. Right before the exam, I quit school for the ...
3
votes
2answers
119 views
Gre practice problem on Linear Transformations
The GRE Practice book includes this problem (#37).
Let $V$ be a finite-dimensional real vector space and let $P$
be a linear transformation of $V$ such that $P^2 = P$.
Which of the following ...
4
votes
1answer
797 views
Tricky GRE Integration Problems
I recently took a practice GRE and I noticed that the integrals on the test were not too advanced or laborious, so long as one noticed the "trick." For instance, the following integral:
$$ \int_{-\pi/...
1
vote
0answers
92 views
Problem on area of curve from GRE Math Subject
Find the area of curve between hyperbola $x^2-y^2=9$, $x$-axis and diameter, which passes through point $(5;4)$
My solution: The equation of line is $y=\frac{4}{5}x$ and it intersect hyperbola at ...
0
votes
2answers
1k views
Explanation of this percentile GRE problem.
Question:
300 test results are integers ranging from 15 to 75, inclusive. Dominick’s result is clearly in the 80th percentile of those results, not the 79th or the 81st.
Quantity A:
Number of other ...
0
votes
2answers
33 views
Question regarding exponents and negative numbers
Is it always safe to assume that $-2^2 = -4$, or is this dependent on notation, i.e. would it be mathematically correct (albeit sloppy) to say $-2^2 = (-2)^2 = 4$? Specifically, I'm asking in the ...
0
votes
0answers
63 views
Word Problem from GRE Quant
Huey's Hip Pizza sells two sizes of square pizzas: a small pizza that measures $10$ inches on a side and costs $\$10$, and a large pizza that measures $15$ inches on a side and costs $\$20$. If two ...
0
votes
2answers
103 views
GRE: Can area of this parallelogram be known?
A GRE question asks whether the area of parallelogram can be found only using the information provided above.
Area of parallelogram = base x height
If we cut off one end to form a triangle and ...
3
votes
2answers
247 views
Weird word problem from GRE Quant
Today when I was solving problems from GRE Manhattan I ran into a strange word problem.
The first line of the problem already seems weird since $\frac{3}{8}$ of $420$ is not an integer, namely it is ...
7
votes
4answers
574 views
F inding out possible remainders when dividing an integer
I was stuck trying to solve a GRE math question, and this question came to my mind when I looked at the solution. The question is
For some integer $q$, $q^2 - 5$ is divisible by all of the following ...
0
votes
0answers
53 views
Geometry book for the mathematics GRE exam
Can someone recommend a geometry textbook for the mathematics GRE?
I'm not looking for a textbook that can be used to teach an undergraduate level course in geometry. Rather, I'm looking for a ...
1
vote
2answers
72 views
Properties of a nonempty subset S of $\mathbb{R}$. [closed]
The solution of the following question is letter (C), but I did not understand why it is letter (C), could anyone clarify this for me please?
thanks!
0
votes
1answer
67 views
Finding the volume of the solid by the method of areas.(math subject GRE exam 1268 Q.22)
The question is in the following picture:
The solution of the question is in the following video,
https://www.youtube.com/watch?v=2zry1DM7I8U&list=PL81IATpFpPBgrG8fZ3tRO41nNypY5xtEP&...
1
vote
1answer
163 views
Lipschitz condition without absolute value implies continuity (GRE 9367 Problem 25)
Let $f$ be a real-valued function with domain $[0,1]$. If there is some $K > 0$ such that $f(x) - f(y) \le K|x-y|$ for all $x,y \in [0,1]$, which of the following must be true?
I don't feel like ...
0
votes
2answers
798 views
Which of the following equations has the greatest number of real solutions?(math subject GRE exam 1268 Q.17)
Could anyone give me a hint for the most rapid way for solving this question (solving it in exactly 2.5 minutes)?
Thanks!
0
votes
2answers
52 views
Statistics problem in GRE Quant
Suppose we have data set: $19, 21, 22, 22, 28, 31, 33, 44, 50$. Find the interquartile range of this set.
First solution: Firstly, we should find the $75$th percentile of this set. $0,75\cdot 9=6,75$...
1
vote
0answers
98 views
Probability question from GRE Quant
The probability that Tom will win the Booker prize is $0.5$, and the probability that John will win the Booker prize is $0.4$. There is only Booker prize to win. What is the probability that at least ...
1
vote
1answer
755 views
Help me focus my study for the GRE math subject exam [closed]
I'm preparing for the GRE Math Subject test, but I'm at a bit of a disadvantage, having never taken an algebra class or a probability class. Obviously I'm not going to learn a semester of abstract ...
1
vote
1answer
835 views
GRE Math Subject Practice Test Question 66
Let $\mathbb{Z}_{17}$ be the ring of integers modulo 17, and let $\mathbb{Z}_{17}^×$ be the group of units of $\mathbb{Z}_{17}$ under multiplication. Which of the following are generators of $\mathbb{...
0
votes
1answer
50 views
Data Interpretation Problem from GRE
This is problem from GRE Quant.
And here is the question:
From definition below graph we have: $\text{Stress Factor} = \dfrac{\text{Diff. Factor}}{\text{Average Time(per question)}}$.
We see that ...
4
votes
4answers
314 views
If $f(x) = p \sin x + qx \cos x + x^2$ is defined for all $x,q,p \in \Bbb R$ and $f(2) = 3$ find $f(-2)$.
I'm preparing for the GRE Subject Test in Mathematics and unfortunately found that can't understand the way the following problem should be done.
The right option is D, but I can't deduce it.
For $x=...
1
vote
0answers
152 views
GRE absolute values multiple answer question
This GRE question is confounding me. The answer given is A, C, D and E.
First off, if you plug in zero for all of the variables, all of the options are right. I see nothing wrong with saying $|0| = ...
1
vote
1answer
82 views
Ambiguous combinatorics from GRE Quant
In how many ways can $2$ doors be selected from $3$ doors for entering and leaving a room?
Options for answers are: $1, 3, 6, 9, 12$.
Since we have 3 doors and we should pick 2 doors for ENTERING ...
1
vote
2answers
259 views
GRE Quant Combinatorics problem
The University of Maryland, University of Vermont, and Emory University have each $4$ soccer players. If a team of $9$ is to be formed with an equal number of players from each university, how many ...
13
votes
4answers
2k views
Which of the following sets has the greatest cardinality?(Math subject GRE exam 0568 Q.61 )
How can I solve this question in only 2.5 minutes? It must be solved using deep insight and intuition, which I do not have. Could anyone help me, please?
Thanks!
Which of the following sets has ...
3
votes
2answers
582 views
Greatest Possible Value of a Function at a Point
If $f$ is a continuously differentiable real-valued function defined on the on the open interval $(-1,4)$ such that $f(3)=5$ and $f'(x) \ge -1$ for all $x$, what is the greatest possible value of $f(0)...
1
vote
1answer
144 views
Inequality from GRE Quant
I am preparing to GRE Quant and I ran into one problem which seems to me bit false.
If $(x+1)^2-2x>2(x+1)+2,$ then $x$ cannot equal which one of the following?
(A) -5
(B) -3
(C) 0
(D) 3
(E) 5
...
0
votes
4answers
206 views
Confusion about the Fundamental Theorem of Calculus
So, I am preparing myself for the math subject GRE with a practice test. Not only did I bomb the test, but I found that even things I thought I understood now seem confusing.
Case in point: the ...
3
votes
2answers
805 views
The group of symmetries of the regular pentagram is isomorphic to what. (Math GRE exam 0568 Q.60)
For me this type of question I have not ever seen it, my understanding to the solution is not clear, and I do not understand why the other choices are wrong, could anyone explain this for me please? ...
0
votes
2answers
94 views
Question from GRE Quant
The rate of data transfer, $r$, over a particular network is directly proportional to the bandwidth, $b$, and inversely proportional to the square of the number of networked computers, $n$.
Quantity ...
2
votes
2answers
181 views
Preimage of Closed Set Under a Continuous Map Isn't Closed?
Problem: In the $xy$-plane, the graph of $x^{\log y} = y^{\log x}$ is
(A) Empty
(B) A single point
(C) A ray in the open first quadrant
(D) A closed curve
(E) The open first quadrant
Here is ...
2
votes
2answers
615 views
Integral of the Product of a Function and Its Derivative
Problem: Let $f$ be a function such that the graph of $f$ is a semicircle $S$ with end points $(a,0)$ and $(b,0)$, where $a < b$. The improper integral $\int_{a}^{b} f(x) f'(x) dx$ is
(A) ...
1
vote
2answers
49 views
For what values of t does the eigenvalues $\lambda_1$,$\lambda_2$ has the value $\lambda_1$+$\lambda_2$ = 1.
Do not know how to solve it, could anyone help me please?
0
votes
2answers
38 views
Determining the number of gallons of fuel that the car used on the trip.
My answer was (C), where I was thinking while I was solving how the unit could be Gallons only, but the correct answer is (A), I do not know why my answer is wrong and why (A) is the correct answer, ...
1
vote
1answer
3k views
Is this Enough for the Math Subject GRE? [closed]
I have been studying for the math GRE for quite sometime now. I have been going through the princeton review and old GRE tests, and in fact without much very difficulty at all. As a way of getting ...
