Search found 19 matches
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: 11694
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: 11694
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: 3600
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: 1674
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 noun...
- by boysangur
Thu Nov 11, 2010 10:52 pm- Forum: Sentence Correction
- Topic: Kaplan SC
- Replies: 11
- Views: 3088
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 ex...
- by boysangur
Sun Nov 07, 2010 7:29 pm- Forum: Data Sufficiency
- Topic: A set of consecutive integers
- Replies: 1
- Views: 887
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: 4907
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....
- by boysangur
Mon Oct 18, 2010 12:23 pm- Forum: Problem Solving
- Topic: In Rwanda, the chance for rain
- Replies: 7
- Views: 5066
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: 5395
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: 130699
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: 16275
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: 1916
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: 2704
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 get...
- by boysangur
Sat Sep 04, 2010 6:16 pm- Forum: Problem Solving
- Topic: OG 216
- Replies: 6
- Views: 3708
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 man...
- by boysangur
Fri Sep 03, 2010 9:16 pm- Forum: Problem Solving
- Topic: how many prime numbers between 1 and 100
- Replies: 13
- Views: 12821