Search found 38 matches
aim-wsc wrote:@banona well this is all you have
work on it.
by the way you are doing good job at math section.
Thank you aim-wsc,
I hope I will so on the 5th March,
My God, it is toooooo close !!!!!!!!!
- by banona
Tue Feb 20, 2007 3:15 pm- Forum: Problem Solving
- Topic: Difficult Math Problem #99 - Permutations
- Replies: 12
- Views: 7736
Answer must be C, wHY ? let consider the following row ; A B C D E If five students are to be arranged so that one siblings (2kids) do never sit togoether, so the only possibilities are for the siblings to sit on the followings positions ; A C A D A E B D B E C E we have at all 6 configurations, for...
- by banona
Tue Feb 20, 2007 3:12 pm- Forum: Problem Solving
- Topic: Difficult Math Problem #99 - Permutations
- Replies: 12
- Views: 7736
here is my thoughts about the third question, DS 1 If a and b are positive integeres what is the value of a+b? 1) a/b = 5/8 2) The greatest common divisor of a and b is 1 1- first statement ;isnot suffisant at all 2- second statement tells that the GCF of both a and b is 1, it is also insuffisant bu...
- by banona
Tue Feb 20, 2007 2:58 pm- Forum: GMAT Math
- Topic: Some doubts in PS and DS
- Replies: 3
- Views: 4449
Re: Difficult Math Problem #99 - Permutations
Do you mean two couples of siblings or two kids who are siblings ? banona, I believe you are misinterpreting the question. The Q only says 2 siblings NOT 2 sets of siblings. You require atleast 2 children to have a sibling pair. . thank you for the your remark, but you would undestand that I am str...
- by banona
Tue Feb 20, 2007 2:38 pm- Forum: Problem Solving
- Topic: Difficult Math Problem #99 - Permutations
- Replies: 12
- Views: 7736
Re: Difficult Math Problem #99 - Permutations
Among 5 children there are 2 siblings. In how many ways can the children be seated in a row so that the siblings do not sit together? (A) 38 (B) 46 (C) 72 (D) 86 (E) 102 oa coming when some people respond with explanations. from diff math doc Do you mean two couples of siblings or two kids who are ...
- by banona
Mon Feb 19, 2007 1:06 pm- Forum: Problem Solving
- Topic: Difficult Math Problem #99 - Permutations
- Replies: 12
- Views: 7736
Hi, let's try on this one; Z^n = 1; many possibilities are ther. As you know any number that is rised to 0 is equal to 1; You may also think of picking numbers to see that ; if n is odd (>0) then Z sould be 1, but if n is even (>0) then Z may be 1 or (-1); Therfore, this first stem can lead to many ...
- by banona
Sat Feb 17, 2007 9:19 am- Forum: Data Sufficiency
- Topic: OG 11, DS #126
- Replies: 5
- Views: 2209
Hi jaheer, For all inequalities, be sure to know the sign of each number before to simplify any inequality; What you did to reach the following expresion (r^2+2)>pr from 1/P > r/(r^2+2) is that you have multiplied by P and then by ( r^2+2) EACH side of the inequality, you can not do that untless you...
- by banona
Sat Feb 17, 2007 5:20 am- Forum: Data Sufficiency
- Topic: OG 11, DS #145, Am i missing something?
- Replies: 6
- Views: 2038
The numbers x and y are three-digit positive integers, this can be translated to : x = X1X2X3 ; AND y= Y1Y2Y3 * AS x + y is a four-digit integer . This only means that (Y1+X1+1 ) > 10 ; PROVIDED that y>x; then hundreds digis of y is superior to hundreds digit of x; so the inequality in Blod becomes ...
- by banona
Fri Feb 16, 2007 12:59 pm- Forum: Problem Solving
- Topic: Difficult Math Problem #98 - Algebra
- Replies: 4
- Views: 7410
Hi isisalaska
Can you rephrase the question, I didn't understand what you mean,
is it a PS or DS ? or what
Good luck
- by banona
Thu Feb 15, 2007 6:45 pm- Forum: Problem Solving
- Topic: Please answer this question I have only 1 day left
- Replies: 2
- Views: 2741
Hy Kandelaki, I wonder if you can use this general formula like : Sn = n ( 2a1 + (n - 1)d ) / 2 I think it's only valid when adding consecutive numbers, like (1, 2,3,......n) or when numbers are equally far from each other; like consecutive evens ( 2; 4; 6; ......2n) or consecutives odds; However, i...
- by banona
Thu Feb 15, 2007 7:06 am- Forum: Problem Solving
- Topic: Difficult Math Problem #97 - Algebra
- Replies: 6
- Views: 3576
very exhaustive list from Kandelaki,
I don't know whether we can classify " work problems" as times & speeds' or in a separate topic;
good luck
- by banona
Thu Feb 15, 2007 6:47 am- Forum: GMAT Math
- Topic: list of subjects on gmat math
- Replies: 8
- Views: 12277
Here is my attempt to solve this difficlt problem: we are looking for the sum ( kK!) as K from 2 to n. First , we can easily eliminate first and second choices, because the first one ( n!+1) is vritually too small to be the sum we are looking for; The second choice ( n+1)! is even; and the sum we ar...
- by banona
Thu Feb 15, 2007 6:39 am- Forum: Problem Solving
- Topic: Difficult Math Problem #97 - Algebra
- Replies: 6
- Views: 3576
That' great 800guy,
You've reached your goal making us thinking and discussing around some problems,
we are waiting for your next question
Thanks
- by banona
Wed Feb 14, 2007 8:16 pm- Forum: Problem Solving
- Topic: Difficult Math Question #1
- Replies: 30
- Views: 26971
I am sorry alpha_gmat and 800guy you gave the same answer as in the word document of " tough math problems" and it's wrong. n is not 79 . In fact, we should check the accuracy of the answers sometimes. I got the same answer following the same path as you (amitamit2020) In fact, I think n= ...
- by banona
Wed Feb 14, 2007 1:42 pm- Forum: Problem Solving
- Topic: Difficult Math Question #1
- Replies: 30
- Views: 26971
Hi,
I agree with amitamit2020 ; Answer should be D
Otherwise, check if expressions are as written in the original question and look at the source;
- by banona
Wed Feb 14, 2007 7:34 am- Forum: Data Sufficiency
- Topic: Question 20, section 17 of "lots of DS questions"
- Replies: 4
- Views: 3858