## Search found 19 matches

#### Probability

###### Problem Solving

Found this problem on intmath.com: The probability that a student passes Mathematics is 2/3 and the probability that he passes English is 4/9. If the probability that he will pass at least one subject is 4/5, what is the probability that he will pass both subjects? OA is [spoiler]14/45[/spoiler] Wh...

by boysangur

Wed Nov 17, 2010 6:06 pm
Forum: Problem Solving
Topic: Probability
Replies: 3
Views: 11290

#### Probability

##### Probability

Found this problem on intmath.com: The probability that a student passes Mathematics is 2/3 and the probability that he passes English is 4/9. If the probability that he will pass at least one subject is 4/5, what is the probability that he will pass both subjects? OA is [spoiler]14/45[/spoiler] Wha...

by boysangur

Wed Nov 17, 2010 2:07 pm
Forum: Problem Solving
Topic: Probability
Replies: 3
Views: 11290

#### probability

###### Problem Solving

If it says "the probability of at least one event" doesn't it mean "probability of one happening or the other or both"? In which case, P (at least 1) = P(A) + P(B) + P(AB). I know it's wrong but could someone explain why?

by boysangur

Tue Nov 16, 2010 9:38 pm
Forum: Problem Solving
Topic: probability
Replies: 7
Views: 3052

#### hard PS factors

###### Problem Solving

What is the value of b if 2x-1 is a factor of 2x^2 + bx + 3 A. -7 B. -3 C. -1 D. 3 E. 7 I have solved it using Factor theorem. 2x-1 = 0 x=1/2 2* 1/4 + b/2 +3 = 0 1/2 + 3 + b/2 = 0 7/2 + b/2 = 0 therefore, b should be -7. Whats the OA? I'm not even familiar with factor theorem, could you explain how...

by boysangur

Mon Nov 15, 2010 4:13 pm
Forum: Problem Solving
Topic: hard PS factors
Replies: 5
Views: 1313

#### Kaplan SC

###### Sentence Correction

Interesting. I marked this one C "beside the lawyer, working with each other". However, The Kaplan explanation claims that "Choice (C) can also be eliminated because it changes the correct one another (used when there are two nouns, as here) to each other (used with more than two nouns)." This expla...

by boysangur

Thu Nov 11, 2010 10:52 pm
Forum: Sentence Correction
Topic: Kaplan SC
Replies: 11
Views: 2559

#### A set of consecutive integers

##### A set of consecutive integers

In a DS problem, I am told that a set consists of 5 consecutive integers and that the sum of elements is 45. The correct answer states that this is enough information to figure out what the set is. The explanation says "only one set of 5 consecutive integers can sum to 45." Could anyone explain to m...

by boysangur

Sun Nov 07, 2010 7:29 pm
Forum: Data Sufficiency
Topic: A set of consecutive integers
Replies: 1
Views: 591

#### Good one

###### Critical Reasoning

Choi: All other factors being equal, children whose parents earned doctorates are more likely to earn a doctorate than children whose parents did not earn doctorates Hart: But consider this: over 70 percentage of all doctorate holders do not have a parent that also holds a doctorate Which of the fo...

by boysangur

Tue Oct 26, 2010 7:33 pm
Forum: Critical Reasoning
Topic: Good one
Replies: 10
Views: 4213

#### In Rwanda, the chance for rain

###### Problem Solving

In Rwanda, the chance for rain on any given day is 50%. What is the probability that it rains on 4 out of 7 consecutive days in Rwanda? a) 4/7 b) 3/7 c) 35/128 d) 4/28 e) 28/135 Good one.... The "consecutive" bit threw me off. I assumed that they meant that it rains on 4 consecutive days. In that c...

by boysangur

Mon Oct 18, 2010 12:23 pm
Forum: Problem Solving
Topic: In Rwanda, the chance for rain
Replies: 7
Views: 4340

#### 300 students study French

###### Problem Solving

Here is what confuses the heck out of me here. It says that 100 students do not study French, which means that those students study Spanish ONLY. So if 100 out of 300 student study Spanish ONLY, doesn't that mean that the rest study French only? In which case, nobody studies both. I know this is wro...

by boysangur

Sat Oct 09, 2010 3:35 pm
Forum: Problem Solving
Topic: 300 students study French
Replies: 9
Views: 4832

#### Difficult GMAT Math Problems

###### GMAT Math

Man, this problem set got me very concerned. Are there really some problems like these on the actual GMAT? Some of them are not very hard but, although it is subjective, some seem a little too hard. Even looking at the solutions, some of them are pretty darn complex and lengthy. Like the solution to...

by boysangur

Tue Sep 07, 2010 10:25 pm
Forum: GMAT Math
Topic: Difficult GMAT Math Problems
Replies: 34
Views: 127623

#### Shortest Distance between a Circle and a Line

###### Problem Solving

O_O ...this is a possible GMAT problem?

I don't even know where to start. What does "circle x^2 + y^2 = 1" even mean??

by boysangur

Tue Sep 07, 2010 9:45 pm
Forum: Problem Solving
Topic: Shortest Distance between a Circle and a Line
Replies: 7
Views: 15474

#### Two Elementary Questions about GMAT Math

##### Two Elementary Questions about GMAT Math

These are probably pretty dumb questions but I must finally clarify these. 1) As far as GMAT concerned, is 0 an even number? Princeton Review tells me it is NOT. Kaplan tells me it IS. Could someone clarify this for me once and for all? Is 0 an even number or not? 2) This one is a little longer but ...

by boysangur

Tue Sep 07, 2010 3:42 pm
Forum: GMAT Math
Topic: Two Elementary Questions about GMAT Math
Replies: 2
Views: 1531

#### study tips to minimize stupid mistakes

###### GMAT Math

i've been doing the OG and QR. for the most part, i find the questions pretty straightforward and generally take less than 2 minutes to solve the problems with few errors. i've been logging my mistakes on flashcards, and getting a lot out of my study sessions. HOWEVER, on the mgmat CAT exams, i fin...

by boysangur

Tue Sep 07, 2010 3:07 pm
Forum: GMAT Math
Topic: study tips to minimize stupid mistakes
Replies: 4
Views: 2291

#### OG 216

###### Problem Solving

I'm actually more confused by the explanation OG provided for this problem. They expressed the first info as: x=y*m/100, which I understand. Then they solved for y: y=x100/m, which I also understand. But then they multiply the fraction by 100 to "convert to an equivalent percent," thus getting 10000...

by boysangur

Sat Sep 04, 2010 6:16 pm
Forum: Problem Solving
Topic: OG 216
Replies: 6
Views: 3390

#### how many prime numbers between 1 and 100

###### Problem Solving

Just encountered this now. I knew how to approach it but what confuses me is that the problem doesn't ask for DISTINCT prime numbers. It just asks "how many prime numbers". So I answered five but apparently, the answer is four? What tells you guys it's asking for distinct numbers? The many prime nu...

by boysangur

Fri Sep 03, 2010 9:16 pm
Forum: Problem Solving
Topic: how many prime numbers between 1 and 100
Replies: 13
Views: 11980