## Search found 659 matches

Thanks Pete.

So the takeaway would be to pay close attention to the context and look for those keywords that hint at distinction between cases?

- by Gurpinder

Tue Nov 08, 2011 2:23 pm- Forum: Problem Solving
- Topic: combination or permutation
- Replies:
**3** - Views:
**1073**

##### distinguish comb/perm

Hi guys, having a little trouble distinguishing the two. Comb = unordered where order doesen't matter. perm = order matters. But, look at this questions: A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fi...

- by Gurpinder

Tue Nov 08, 2011 2:08 pm- Forum: GMAT Math
- Topic: distinguish comb/perm
- Replies:
**1** - Views:
**1389**

##### combination or permutation

I know that its ordered vs. unordered that decides which one it is; but is that the bottom line? can someone elaborate on what it means by ordered vs. unordered ? The principal of a high school needs to schedule observations of 6 teachers. she plans to visit one teacher each day for a work week (M-F...

- by Gurpinder

Fri Nov 04, 2011 11:44 am- Forum: Problem Solving
- Topic: combination or permutation
- Replies:
**3** - Views:
**1073**

Say, the work has 12 parts. Hence, X does one part in one hour. Hence, Y does 1/10 of one part in one hour. This is where I am confused. How can x do one part in one hour? X only does 2/3 of the job. So wouldn't you take the amount of work he "actually" did to calculate rate? Thats how I am getting...

- by Gurpinder

Thu Oct 27, 2011 11:19 am- Forum: Problem Solving
- Topic: Work Problem
- Replies:
**3** - Views:
**953**

Thanks Anurag.

I dont understand what I am doing wrong. Since we are plugging in a number for work, lets say work = 1.

----r-------t------d

x -- r -----12------2/3

12r=2/3

36r=2

r=1/18 <- rate of x

----r-------t------d

y -- 1/180 ---t------1/3

t/180=1/3

t=60

- by Gurpinder

Thu Oct 27, 2011 10:53 am- Forum: Problem Solving
- Topic: Work Problem
- Replies:
**3** - Views:
**953**

##### Work Problem

Working independently x takes 12 hours to finish a certain work. He finishes 2/3 of the work. The rest of the work is finished by Y whose rate is 1/10 of X. In how much time does Y finish his work? I tried plugging in a smart number for work (12) which screws up the answer. Why is plugging in a num...

- by Gurpinder

Thu Oct 27, 2011 9:37 am- Forum: Problem Solving
- Topic: Work Problem
- Replies:
**3** - Views:
**953**

Hi Kavita, What a coincidence. My last message in this post was about a year back and then I took a break. Yesterday, I was doing word translations again and you messaged! Thanks for your advice. Currently, I am quite strong in number properties, equations, and FDP problems. However, I am still stru...

- by Gurpinder

Fri Oct 21, 2011 8:37 am- Forum: GMAT Strategy
- Topic: verbal expression to algebraic expressions
- Replies:
**7** - Views:
**2500**

##### Redundant Info in an OG simple functions question?

The question is quite simple. However, what is the point of stating the sequence {2,4,7} in the question? The reason I am asking this is because, I thought GMAT questions DO NOT provide useless information. And I got the right answer without even looking at the sequence numbers. Just curious. Maybe ...

- by Gurpinder

Fri Oct 07, 2011 10:12 am- Forum: Problem Solving
- Topic: Redundant Info in an OG simple functions question?
- Replies:
**2** - Views:
**546**

- by Gurpinder

Thu Oct 06, 2011 1:19 pm- Forum: GMAT Strategy
- Topic: multiplying by variables in inequalities
- Replies:
**2** - Views:
**729**

- by Gurpinder

Thu Oct 06, 2011 12:25 pm- Forum: Data Sufficiency
- Topic: tough inequality
- Replies:
**3** - Views:
**1015**

##### tough inequality

if x is NOT = 0, is (x^2 +1)/x > Y? (1) x = y (2) y>0 I don't understand how (1) is not sufficient. To multiply by variable, we need to take the positive and the negative: (x^2 +1)/x > Y x^2 +1 > xy ? And stmt 1 says y=y hence the question becomes, x^2+1>x^2 ? In which case, YES! regardless of wheth...

- by Gurpinder

Thu Oct 06, 2011 12:05 pm- Forum: Data Sufficiency
- Topic: tough inequality
- Replies:
**3** - Views:
**1015**

##### multiplying by variables in inequalities

In the MGMAT book, it mentions that when multiplying by unknown variables, take both positive/negative scenarios into account

4/x<1/3?

1. 12<x

2. little confused here. do I take x to be -x?

4/-x<1/3

12<-x

-12>x?

?????

- by Gurpinder

Thu Oct 06, 2011 10:32 am- Forum: GMAT Strategy
- Topic: multiplying by variables in inequalities
- Replies:
**2** - Views:
**729**

##### must you always check the validity of an absolute value?

Do you always have to check whether the 2 solutions you got are valid?

- by Gurpinder

Fri Sep 30, 2011 8:45 am- Forum: GMAT Math
- Topic: must you always check the validity of an absolute value?
- Replies:
**3** - Views:
**1861**

ahhh

so when a question asks for a value it has to be a SINGLE NUMERICAL value. it can't be a variable OR multiple values.

correct?

- by Gurpinder

Thu Sep 29, 2011 8:47 am- Forum: Data Sufficiency
- Topic: Absolute Value confusion
- Replies:
**3** - Views:
**748**

##### Absolute Value confusion

Not quite sure about (1).

(1) basically says that x = -x and plugging that into the question, = x

The book says that the value of an absolute value can be 0 or x? Doesn't make sense!

- by Gurpinder

Thu Sep 29, 2011 8:23 am- Forum: Data Sufficiency
- Topic: Absolute Value confusion
- Replies:
**3** - Views:
**748**