## Search found 266 matches

#### Exponents+ absolutes

###### Data Sufficiency

by Morgoth

Sun Sep 27, 2009 11:34 am
Forum: Data Sufficiency
Topic: Exponents+ absolutes
Replies: 3
Views: 794

#### Exponents+ absolutes

##### Exponents+ absolutes

a and b are integers and a is not equal to b

Is lal*b > 0 ?

Statement I

la^bl > 0

Statement II

lal^b is a non zero integer

[spoiler]OA:C[/spoiler]

by Morgoth

Sun Sep 27, 2009 9:56 am
Forum: Data Sufficiency
Topic: Exponents+ absolutes
Replies: 3
Views: 794

#### combinatorics-three guys and three girls

##### Re: combinatorics-three guys and three girls

Hi, This is a combinatorics problem that I'm looking for a similar approach to solving.(as I've done one problem below) Three guys and three girls sit down in a row of six chairs. If no guy will sit next to another guy and no girl will sit next to another girl, in how many different ways can the gu...

by Morgoth

Wed Sep 16, 2009 4:16 am
Forum: Problem Solving
Topic: combinatorics-three guys and three girls
Replies: 1
Views: 1053

#### Tough question from KAPLAN

###### Data Sufficiency

here is a nice solution.

http://www.beatthegmat.com/inequality-w ... 14674.html

by Morgoth

Mon Aug 17, 2009 2:41 am
Forum: Data Sufficiency
Topic: Tough question from KAPLAN
Replies: 1
Views: 780

#### Harvard to Accept GRE... Others to Follow?

Interesting! My thought is that it probably won't help the quantiatively-challenged, though. In a way, it hurts: with the GRE you are competing with all of the engineering PhDs, etc. etc. But what about a person such as me, who is not quantitatively challenged but verbally is.[as per GMAT] I have t...

by Morgoth

Sun Aug 16, 2009 3:45 pm
Topic: Harvard to Accept GRE... Others to Follow?
Replies: 5
Views: 1907

#### Mumbai GMAT meet

###### Let's Meet Up

raunekk wrote:hi guys... anyone who in taking GMAT in the coming months??

Lets meet up guys..
I am taking the test very soon! Lets meet up.....

Last run for me as well.

by Morgoth

Sun Aug 16, 2009 1:58 pm
Forum: Let's Meet Up
Topic: Mumbai GMAT meet
Replies: 25
Views: 10289

#### Time and work

##### Re: Time and work

A can complete a project in 20 days and B can complete the same project in 30 days. If A and B start working on the project together and A quits 10 days before the project is completed, in how many days will the project be completed? A. 18 days B. 27 days C. 26.67 days D. 16 days E. 12 days A's rat...

by Morgoth

Sun Aug 16, 2009 7:55 am
Forum: Problem Solving
Topic: Time and work
Replies: 12
Views: 2138

#### AP-IV

##### Re: AP-IV

If S1, S2, S3, ... , S50 are the sums of 20 terms of AP series whose first terms are 1, 2, 3, 4, ..., and whose common difference are 1,3,5,7,...what is the value of: S1+S2+S3+..+S50 S1, first term = 1, common difference = 1, no. of terms = 20 S2, first term = 2, common difference = 2, no. of terms...

by Morgoth

Sun Aug 16, 2009 4:11 am
Forum: Problem Solving
Topic: AP-IV
Replies: 3
Views: 856

#### AP-III

##### Re: AP-III

IMO D sum of m terms = m/2 [2a + (m-1)d] sum of n terms = n/2 [2a + (n-1)d] m/2 [2a + (m-1)d] / n/2 [2a + (n-1)d] = m^2 / n^2 you solve this to get 2a = d mth term = a + (m-1)d nth term = a + (n-1)d substitute d=2a a+ (m-1)2a / a+ (n-1)2a = (a + 2am - 2a )/ (a + 2an - 2a) = 2m-1 / 2n-1 Hence D

by Morgoth

Sun Aug 16, 2009 3:56 am
Forum: Problem Solving
Topic: AP-III
Replies: 4
Views: 1015

#### Sum of integers in table

##### Re: Sum of integers in table

There are many ways of solving this question, I'll show you 1

if you look at the rows closely, every row is a table of a number starting from 1 to 7

1+2+3+4+5+6+7 = 28

28 + -2(28) + 3(28) -4(28) + 5 (28) -6(28) + 7(28)

= 28 ( 1-2+3-4+5-6+7) = 4*28 = 112

Hope this helps.

by Morgoth

Sun Aug 16, 2009 3:27 am
Forum: Problem Solving
Topic: Sum of integers in table
Replies: 5
Views: 3809

#### median values

##### Re: median values

if 0< x< 1

we can arrange the sequence in the ascending form

x^3 < x^2 < x < sqroot x < x^-1

median = middle value = x

If you are unsure of the sequence, just plug in x= 1/4

1/64 < 1/16 < 1/4 < 1/2 < 4

Hence A.

Hope this helps.

by Morgoth

Sun Aug 16, 2009 3:22 am
Forum: Problem Solving
Topic: median values
Replies: 2
Views: 1066

#### ratio of triangles

##### Re: ratio of triangles

Base of ∆PQR = 10-6 = 4 [only look at the values of x axis of points P & R] Height of ∆PQR = 4 [look at the value of y axis of point Q] Area of ∆PQR = 1/2 * 4 * 4 = 8 Similarly, you can calculate the area of ∆LMN Area of ∆LMN = 1/2 * 12 * 12 = 72 Fraction = 8/72 = 1/9 H...

by Morgoth

Sun Aug 16, 2009 3:15 am
Forum: Problem Solving
Topic: ratio of triangles
Replies: 4
Views: 4499

#### Length of a triangle

##### Re: Length of a triangle

Question BC=? AD = BC, let angle ABD = y x+y = 2x [external triangle theorem] y = 2x-x = x y=x if y=x, then AD=BD. AD= BD and BC=BD, therefore AD=BC Statement I AD=6, therefore BC=6 Sufficient. Statement II x=36, we cannot find the side just by knowing the angle. Insufficient. Hence A. Hope this hel...

by Morgoth

Sun Aug 16, 2009 3:08 am
Forum: Problem Solving
Topic: Length of a triangle
Replies: 1
Views: 904

#### median question

##### Re: median question

ern5231 wrote:If m is the median of 3 consecutive positive integers then which one must be true? (1) m>0 (2) m is odd or even (3) m is an integer.

I dont have the solution to this but i feel that 1 and 3 must be true. What is your take on this?
I agree.

2) m could be odd or even

by Morgoth

Sun Aug 16, 2009 3:01 am
Forum: Problem Solving
Topic: median question
Replies: 4
Views: 907

#### combination

###### Problem Solving

jsk988 wrote:I understand the explanation, but why doesn't it match up with any of the answer choices?
I believe the answer options are incorrect.

by Morgoth

Sun Aug 16, 2009 12:35 am
Forum: Problem Solving
Topic: combination
Replies: 4
Views: 929