Search found 24 matches


understanding concepts

My sticking point seems to be probability and ratios allegations,

pls suggest any good books for this pls. thanks

by madhan_dc

Mon Mar 14, 2011 6:01 pm
Forum: Data Sufficiency
Topic: understanding concepts
Replies: 1
Views: 949

x^y < y^x?

if x and y are non zero integers is x^y < y^x?

1. x=y^2

2. y >2

the explanation in the OG is not very clear. Can someone please explain. thanks.

by madhan_dc

Mon Mar 14, 2011 5:48 pm
Forum: Data Sufficiency
Topic: x^y < y^x?
Replies: 2
Views: 1125

official guide qant review

DS pb # 116. if 75% of the guests at a certain banquet ordered dessert, what percent of the guests ordered coffee? 1. 60 % of guests who ordered dessert also ordered coffee 2. 90% of the guests who ordered coffee also ordered dessert the answer explanation assumes that each guest ordered either dess...

by madhan_dc

Fri Mar 11, 2011 8:31 am
Forum: Data Sufficiency
Topic: official guide qant review
Replies: 1
Views: 1603

arith mean - median

Please explain a solution. Thanks For a certain set of n numbers, where n>1, is the avg(arth mean) equal to the median? 1. if the n numbers are listed in increasing order, then the difference between any pair of sucessive numbers in the set is 2. 2. the range of the n numbers in the set is 2(n-1) th...

by madhan_dc

Thu Mar 10, 2011 9:14 pm
Forum: Data Sufficiency
Topic: arith mean - median
Replies: 1
Views: 1100

Since the intersection point is both negative, i picked a point in that quadrent and since r has greater slope it will be steeper than s. From that can i say the y intercept of r will be greater than s?

by madhan_dc

Mon Feb 28, 2011 11:34 am
Forum: Data Sufficiency
Topic: Coordinate Geo
Replies: 17
Views: 3050

As per one of the previous posts. I dont understand why we cannot divide each side by x in statement 1. Can anyone please explain this?

i divided both sides by x in statement 1 and got x =2

my answer was D.

by madhan_dc

Mon Feb 28, 2011 10:08 am
Forum: Data Sufficiency
Topic: What is the value of x*?
Replies: 29
Views: 13540

Thanks Anurag, it is so obvious after i read your explanation. How do i develop this kind of thought process?

keep practicing? Eat tuna?

by madhan_dc

Fri Feb 25, 2011 11:00 am
Forum: Data Sufficiency
Topic: A school administrator
Replies: 3
Views: 1256

1. b>a values i picked a b 2 3 -3 -2 i found that for any vlaue of a and b when b>a, | a| - |b| turned out to be <= |a-b| hence sufficent similarly for 2. a> 0 a b 2 1 2 4 2 -1 2 0 again for all values of a,b, |a| - |b| turned out to be <= |a-b| heance sufficent. I would have picked D. Either statem...

by madhan_dc

Thu Feb 24, 2011 10:51 am
Forum: Data Sufficiency
Topic: Absolute Values
Replies: 15
Views: 3191

Alligation?

A container contains 40 litres of milk. From this container 4 litres of milk was taken away and replaced by water. This process was repeated further 2 times. How much milk is contained by the container. This is what i thought: Milk water begin 40 0 1st 36 4 2nd 32 8 3rd 28 12 so the answer is 28. Bu...

by madhan_dc

Wed Feb 23, 2011 3:00 pm
Forum: Problem Solving
Topic: Alligation?
Replies: 5
Views: 2551

DS strategy

I am always falling for this trap. in cases where statement looks like it validates statement 2. I choose C but statement two alone would have been sufficient I am thinking i will start with looking at option 2 first going forward. Most often than not the option B seems to be the sufficient one. any...

by madhan_dc

Wed Feb 16, 2011 12:10 pm
Forum: Data Sufficiency
Topic: DS strategy
Replies: 1
Views: 1035

How come in posts like these i dont see the question in the first post? Is it in an attachment?

by madhan_dc

Wed Feb 16, 2011 11:05 am
Forum: Data Sufficiency
Topic: Common Divisor
Replies: 3
Views: 1158

Yes. that is what i am following. but i figured i will ask some advice based on my progress and weakness.

by madhan_dc

Tue Feb 15, 2011 7:48 pm
Forum: GMAT Strategy
Topic: 3 month study plan to kill this bitch!
Replies: 4
Views: 1751

3 weeks in the prep. Only done with Kaplan GMAT math workbook. I know I know. I need to pick up speed. my worst areas. data sufficiency problems with ratios, hours worked, proportions word problems with ratios, probability, hours worked, proportions any suggestions on where i go from here? I am thin...

by madhan_dc

Tue Feb 15, 2011 6:38 pm
Forum: GMAT Strategy
Topic: 3 month study plan to kill this bitch!
Replies: 4
Views: 1751

My thought process. numbers : (a) a a b or (b) b a a depending on which one is bigger 1. median = range (a) a = b - a or b = 2a therefore a,a,2a hence mode equals range (b) a = a - b or b = 0 therefore 0, a,a hence mode equals range sufficent by itself 2. the largest value is twice the smallest valu...

by madhan_dc

Fri Feb 11, 2011 2:47 pm
Forum: Data Sufficiency
Topic: mode equal the range
Replies: 6
Views: 2359

average

Does the avg (arith. mean) of a, b, c equal c?

1. c-a = c+b

2. c=0

my answer is 1.

book answer is 3 1 and 2 are sufficent.


my approach

from 1, a+b = 0

mean a+b+c/3 = 0+c/3

since c/3 cannot be equal to c i thought 1 is sufficent.

by madhan_dc

Thu Feb 10, 2011 8:10 pm
Forum: Data Sufficiency
Topic: average
Replies: 1
Views: 967