http://www.urch.com/forums en Sat, 21 Nov 2009 00:27:29 GMT vBulletin 60 http://www.urch.com/forums/tm_images/misc/rss.jpg http://www.urch.com/forums http://www.urch.com/forums/gre-math/129087-quantitative-other-counting-problem.html Fri, 20 Nov 2009 22:32:36 GMT How many positive integers less than 10,000 are there in which the sum of the digits equals 5? (A) 31 (B) 51 (C) 56 (D) 62 (E) 93 I have no idea how to solve this problem except listing out the possibilities. However, that way takes a lot of time? Do you have a better way to solve this? Kwan How many positive integers less than 10,000 are there in which the sum of the digits equals 5?
(A) 31
(B) 51
(C) 56
(D) 62
(E) 93

I have no idea how to solve this problem except listing out the possibilities. However, that way takes a lot of time? Do you have a better way to solve this?

Kwan ]]> GRE Math Kwan http://www.urch.com/forums/gre-math/129087-quantitative-other-counting-problem.html http://www.urch.com/forums/gre-math/129085-quantitative-counting.html Fri, 20 Nov 2009 22:13:47 GMT In how many ways can A, B, C, D, E and F be seated if A and B cannot be seated next to each other? (A) 240 (B) 360 (C) 480 (D) 600 (E) 720 Please, give me the shortest solution. My answer is 480. Kwan In how many ways can A, B, C, D, E and F be seated if A and B cannot be seated next to each other?
(A) 240
(B) 360
(C) 480
(D) 600
(E) 720

Please, give me the shortest solution. My answer is 480.

Kwan ]]> GRE Math Kwan http://www.urch.com/forums/gre-math/129085-quantitative-counting.html http://www.urch.com/forums/gre-math/129080-class-room-solution.html Fri, 20 Nov 2009 21:08:10 GMT In a certain class, there are four students in the first row: three girls (Ann, Barbara, and Cathy), and one boy (David). The teacher will call on one of these students to solve a problem at the board. When the problem is completed, the teacher will call on one of the remaining students in the... In a certain class, there are four students in the first row: three girls (Ann, Barbara, and Cathy), and one boy (David). The teacher will call on one of these students to solve a problem at the board. When the problem is completed, the teacher will call on one of the remaining students in the first row to do a second problem at the board. What is the probability that David will be one of the two students called?

CB ]]> GRE Math computer-bot http://www.urch.com/forums/gre-math/129080-class-room-solution.html http://www.urch.com/forums/gre-math/129079-softball-team.html Fri, 20 Nov 2009 20:57:51 GMT A softball team plays two games each weekend, one on Saturday and the other on Sunday. The probability of winning the game scheduled for next Saturday is 3/5 and the probability of winning the following game, scheduled for Sunday, is 4/7. What is the probability that the team will win at least one... A softball team plays two games each weekend, one on Saturday and the other on Sunday. The probability of winning the game scheduled for next Saturday is 3/5 and the probability of winning the following game, scheduled for Sunday, is 4/7. What is the probability that the team will win at least one of the two games?


CB ]]> GRE Math computer-bot http://www.urch.com/forums/gre-math/129079-softball-team.html http://www.urch.com/forums/gre-math/129078-cookies-assortment.html Fri, 20 Nov 2009 20:32:08 GMT ) In a bag of cookies, there are 4 chocolate chip cookies, 8 sugar cookies, and 6 oatmeal cookies. Steve reaches into the bag without looking and takes out 2 cookies. What is the probability that they are both chocolate chip cookies? A. 12/306 B. 12/109 C. 8/306 D. 2/4 E. 3/5 CB ) In a bag of cookies, there are 4 chocolate chip cookies, 8 sugar cookies, and 6 oatmeal cookies. Steve reaches into the bag without looking and takes out 2 cookies. What is the probability that they are both chocolate chip cookies?

A. 12/306
B. 12/109
C. 8/306
D. 2/4
E. 3/5

CB ]]> GRE Math computer-bot http://www.urch.com/forums/gre-math/129078-cookies-assortment.html http://www.urch.com/forums/gre-math/129075-power-prep-problems.html Fri, 20 Nov 2009 19:39:18 GMT Could someone show me how to do these problems? Thanks in advance! 1. absolute value (r-s)+abs value (t-r) = abs value (t-s) Col A abs value r Col B abs value t 2. Seven one dollar bills are to be distributed among lucia, gomez and domingo so that each person receives atleast one dollar. Could someone show me how to do these problems? Thanks in advance!

1. absolute value (r-s)+abs value (t-r) = abs value (t-s)
Col A
abs value r
Col B
abs value t

2. Seven one dollar bills are to be distributed among lucia, gomez and domingo so that each person receives atleast one dollar.

col A
no. of ways to distribute the bills so that atleast one person receives atleast $3

Col B
The total no. of ways to distribute the bills ]]> GRE Math vasoolraja http://www.urch.com/forums/gre-math/129075-power-prep-problems.html http://www.urch.com/forums/gre-math/129070-probability-problem.html Fri, 20 Nov 2009 19:10:24 GMT *HOW??*:mad: If thats true then 1 = P(Only men) + P(Only Women) +...]]> From a group of 10 women and 5 men, 2 people are selected at random to form a committee. Find the probability that exactly 1 man and 1 woman is selected.

P(exactly 1 man and 1 woman) = 1 - P(Only men) - P(Only Women) --> HOW??:mad:

If thats true then

1 = P(Only men) + P(Only Women) + P(exactly 1 man and 1 woman)

Is the above equation true??
CB ]]> GRE Math computer-bot http://www.urch.com/forums/gre-math/129070-probability-problem.html http://www.urch.com/forums/gre-math/129029-help-solve-these-questions.html Fri, 20 Nov 2009 05:37:36 GMT 12 x is an integer A: The smallest value of x for which the inequality does not hold]]> Question 1
Four people are sitting in a row on a bench. The names of the people are A, B, C and D. What is the probability that A and B are sitting next to each other?
Answer - 1/2


Question 2
(4x - 3)2 > 12
x is an integer

A: The smallest value of x for which the inequality does not hold
B: 0

Answer - The value in column A is larger ]]> GRE Math tradahoo http://www.urch.com/forums/gre-math/129029-help-solve-these-questions.html http://www.urch.com/forums/gre-math/129028-confusing-word-problem.html Fri, 20 Nov 2009 04:35:33 GMT Rachel and Rob live 190 miles apart. They both drive in a straight line towards each other to meet for tea. If Rachael drives at 50 mph and Rob at 70 mph, then how many miles apart will they be exactly 45 minutes before they meet? Rachel and Rob live 190 miles apart. They both drive in a straight line towards each other to meet for tea. If Rachael drives at 50 mph and Rob at 70 mph, then how many miles apart will they be exactly 45 minutes before they meet? ]]> GRE Math keenkriti http://www.urch.com/forums/gre-math/129028-confusing-word-problem.html http://www.urch.com/forums/gre-math/129025-help-powerprep-sequence-problem.html Fri, 20 Nov 2009 01:51:13 GMT =1, An+1=An + 4. Which of the following represents the nth term in the sequence? (1) 4n-3 (2) 4n-1 (3) 4n (4) 4n+1 (5) 4n+4]]> Let A1, A2, A3...An be a sequence of positive numbers where A1 = 1 and for n>=1, An+1=An + 4. Which of the following represents the nth term in the sequence?
(1) 4n-3
(2) 4n-1
(3) 4n
(4) 4n+1
(5) 4n+4 ]]> GRE Math hetpatel http://www.urch.com/forums/gre-math/129025-help-powerprep-sequence-problem.html http://www.urch.com/forums/gre-math/128994-please-explain.html Thu, 19 Nov 2009 15:14:50 GMT QUES 1. (1000+1),(1000+2),(1000+3),(1000+4) is divisible by which number a) 4 b) 6 c)12 d)24 e)16 Ans:16 QUES 2. COL A: (1/2)^-2 QUES 1. (1000+1),(1000+2),(1000+3),(1000+4) is divisible by which number
a) 4
b) 6
c)12
d)24
e)16
answer:16

QUES 2.
COL A: (1/2)^-2
COL B: (1/-2)^-2 ]]> GRE Math keenkriti http://www.urch.com/forums/gre-math/128994-please-explain.html http://www.urch.com/forums/gre-math/128967-solve-these.html Thu, 19 Nov 2009 02:35:27 GMT 1/(x-y)^-1+1/(x+y)^-1=4 Possible Values of x and y? ** How to approach these kinds of questions? Given that two stations ‘A’ and ‘B’ are 500 km apart. A train from station ‘A’ has started towards the station ‘B’ at a certain speed. If after one hour, another train has started from the station... 1/(x-y)^-1+1/(x+y)^-1=4

Possible Values of x and y? ** How to approach these kinds of questions?

Given that two stations ‘A’ and ‘B’ are 500 km apart. A train from station ‘A’ has started towards the station ‘B’ at a certain speed. If after one hour, another train has started from the station ‘B’ towards the station ‘A’ at a certain speed. At what distance do they meet from the station ‘B’? ]]> GRE Math manU_2 http://www.urch.com/forums/gre-math/128967-solve-these.html http://www.urch.com/forums/gre-math/128931-if-wy-21-xz-26-yz-twice-wx-what-value-xy.html Wed, 18 Nov 2009 13:08:32 GMT I need some help getting to the correct answer of 16.

Edit: Nevermind. I found the source of this problem and apparently the expressions 'WY', 'XZ', 'YZ', 'WX', and 'XY' refer to distances (as opposed to representing the multiplication of two factors). That makes all the difference. The problem as presented in the source material actually says "On segment WZ above, if WY = 21,..." and there's a number line that looks something like this.

W-----X-----Y----------Z

Anyway, if anyone's interested here's how I solved it. To make things less confusing for myself I named the distance between W and X 'a', the distance between X and Y 'b', and the distance between Y and Z 'c'. This produces the following equations.

a + b = 21
b + c = 26
c = 2a

I solved for 'b' in the first equation:

b = 21 - a

I substituted '21 - a' into the second equation:

21 - a + c = 26
c = a + 5

I substituted 'a + 5' into the third equation:

a + 5 = 2a
a = 5

I then plugged the last result into the first equation:

5 + b = 21
Answer: b = 16 = the distance XY ]]> GRE Math proudhon http://www.urch.com/forums/gre-math/128931-if-wy-21-xz-26-yz-twice-wx-what-value-xy.html http://www.urch.com/forums/gre-math/128921-practice-test-begin-after-reading-nova.html Wed, 18 Nov 2009 10:20:09 GMT Hi everyone, I just finished reading the math section of Nova this morning and I would like someone to tell me which practice tests I should begin with for math. Should I start with power prep? Which others are recommended and is there any order I should follow? I mean, what practice test should... Hi everyone,

I just finished reading the math section of Nova this morning and I would like someone to tell me which practice tests I should begin with for math. Should I start with power prep? Which others are recommended and is there any order I should follow? I mean, what practice test should be done first and which should follow, eg, power prep, big book, etc.

Or is power prep is enough?

Thanks alot. ]]> GRE Math kingmarto http://www.urch.com/forums/gre-math/128921-practice-test-begin-after-reading-nova.html http://www.urch.com/forums/gre-math/128841-please-provide-solution.html Tue, 17 Nov 2009 03:30:53 GMT Jewels in a crown consists of diamonds, rubies and emeralds. If the ratio of diamonds to rubies is 5/6 and the ratio of rubies to emerald is 8/3, what is the least number of jewels that could be in the tiara? 16 22 40 53 67 Jewels in a crown consists of diamonds, rubies and emeralds. If the ratio of diamonds to rubies is 5/6 and the ratio of rubies to emerald is 8/3, what is the least number of jewels that could be in the tiara?

16
22
40
53
67 ]]> GRE Math keenkriti http://www.urch.com/forums/gre-math/128841-please-provide-solution.html