Search found 102 matches
Putting x=-2 & y=0, we get f(0)=-1
Putting x=-2 & y=2, we get f(2)= 4
Putting x=1 & y=1,we get f(1)= 1
[spoiler]Finally putting x=1 & y=2,we get f(3)= 8
Option E[/spoiler]
- by firdaus117
Mon May 10, 2010 8:07 am- Forum: Problem Solving
- Topic: f (x + y) – f (x) – f (y) = x y + 1
- Replies: 2
- Views: 1270
Only two points viz p1 and p2 are possible on number line x+y=4 that lie at a distance of 1 unit from other line 4 x + 3 y = 10.
- by firdaus117
Wed Mar 17, 2010 10:02 am- Forum: Problem Solving
- Topic: lie at a unit
- Replies: 19
- Views: 2842
Good to see that the OA is matched somehow, the discontinued intervals must not be shown as continuous . Any better explanation to this peculiar problem that only a very few would find on GMAT? Totally agree!But I got too bored typing all that stuff and missed x is not equal to -1 and +1.It's bette...
- by firdaus117
Sat Mar 13, 2010 6:20 am- Forum: Problem Solving
- Topic: x ≠±1
- Replies: 5
- Views: 1352
- by firdaus117
Thu Mar 11, 2010 7:44 am- Forum: Problem Solving
- Topic: Counting - Six mobsters
- Replies: 59
- Views: 27911
How many points on the line x + y = 4 are there.............kstv wrote:x + y = 4 and 4 x + 3 y = 10 are not parallel nor are they intersecting at 90°. So there should be 4 points.
Four points but two each on the two lines.
- by firdaus117
Thu Mar 11, 2010 12:10 am- Forum: Problem Solving
- Topic: lie at a unit
- Replies: 19
- Views: 2842
Yeah probability questions are considered a bit on difficult side for GMAT.You can however solve these questions if you approach them logically.Every sentence in this question is giving an information which we can't ignore. no country has more than one more runner than any other country So fifteen r...
- by firdaus117
Thu Mar 11, 2010 12:04 am- Forum: Problem Solving
- Topic: Permutation Question
- Replies: 1
- Views: 1104
- by firdaus117
Wed Mar 10, 2010 7:47 am- Forum: Problem Solving
- Topic: lie at a unit
- Replies: 19
- Views: 2842
The sequence is GYR......GYR......But we have no information on green tiles.So,two or more than two green tiles can occur together. Both statements are insufficient together because even if we can get the color of 19 th tile,we can't say for sure how many greens are appearing after a yellow tile. IM...
- by firdaus117
Wed Mar 10, 2010 4:41 am- Forum: Data Sufficiency
- Topic: Tiles
- Replies: 9
- Views: 2053
Hey November Rain, Your posting looks interesting but could you please clarify my doubts below: I think we could also count probabilities of even nos that coming out for each set as following: for X, there are 1/3 of probabilities of coming out even for Y, there are 2/3 of probabilities of coming o...
- by firdaus117
Wed Mar 10, 2010 4:26 am- Forum: Problem Solving
- Topic: Probability
- Replies: 9
- Views: 1725
Case 1 mod x-1>0 which means x>1 and x<-1 i.e. -1>x>1 -------- (1) Multiply both sides by mod x-1, mod x +1 < 4(mod x-1) 3mod x > 5 mod x>5/3 -5/3>x>5/3 ----------(2) Combining 1 and 2,permissible values of x will lie in interval -5/3>x>5/3 --------------(3) Case 2 mod x-1<0 i.e. -1<x<1 ------------...
- by firdaus117
Wed Mar 10, 2010 3:49 am- Forum: Problem Solving
- Topic: x ≠±1
- Replies: 5
- Views: 1352
if u take any no ( except 2 ) and then add any prime number ( obviously greater than the number wch u have taken then their sum will be EVEN ) N when u take x= 2 and add any prime no then sum is ODD this is sufficient to say X IS ONLY 2 hence ans is D if u still disagree then give ex wch contradict...
- by firdaus117
Wed Mar 10, 2010 3:15 am- Forum: Data Sufficiency
- Topic: number properties
- Replies: 6
- Views: 1569
Let the price of one bottle of Champagne be $ P and monthly pay be V.
12 V=200 +P ------- (1)
9V=120 +P-------- (2)
3V=80
or,240=120+P (substituting in 2)
[spoiler]or,P=120 Option E[/spoiler]
- by firdaus117
Tue Mar 09, 2010 5:22 am- Forum: Problem Solving
- Topic: plus one bottle of Champagne
- Replies: 3
- Views: 1002
- by firdaus117
Tue Mar 09, 2010 5:10 am- Forum: Problem Solving
- Topic: merchant offers
- Replies: 1
- Views: 984
It is evident that middle digit of the number is to be the largest of three digits in the number as per condition. For y=1,no numbers possible as x is not equal to zero. For y=2,x=1 and z=0,1 total numbers possible=1*2 For y=3,x=1,2 and z=0,1,2 total numbers possible=2*3 For y=4,x=1,2,3 and z=0,1,2,...
- by firdaus117
Tue Mar 09, 2010 5:05 am- Forum: Problem Solving
- Topic: x < y, z < y and x ≠0
- Replies: 2
- Views: 6688
Rephrasing the question,we can say that the question asks if the given statements are sufficient to prove that "the distance between x and y is greater than that between x and z or not". Statement I The absolute value of y is greater than that of z.No information about x.Hence insufficient...
- by firdaus117
Tue Mar 09, 2010 4:41 am- Forum: Data Sufficiency
- Topic: |x – y|>|x-z|?
- Replies: 3
- Views: 1303