Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 17 Apr 2015, 19:24

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# 1) If xy=1, what is the value of 2(x+Y)^2/ 2(x-Y)^2? a)2 b)4

Author Message
TAGS:
Manager
Joined: 23 Mar 2006
Posts: 76
Followers: 1

Kudos [?]: 1 [0], given: 0

1) If xy=1, what is the value of 2(x+Y)^2/ 2(x-Y)^2? a)2 b)4 [#permalink]  01 May 2006, 11:08
1) If xy=1, what is the value of 2(x+Y)^2/ 2(x-Y)^2?

a)2
b)4
c)8
d)16
e)32

2) If x is positive, is x>3?

a) (x-1)^2>4
b) (x-1)^2>9

The next one is really funny, I think is may be a misprint. But I'm not sure it GMAT Prep can have a misprint!!

3) n, m are positive intergers. What is the remainder when 3^(4n+2) is divided by 10?

a) n=2
b) m=1

Also guys, I notice my weak areas are inequalities and coordinate geometry. Can you please direct me to some good resources for these two areas. I have 5 days to go for the D-Day!
 Kaplan Promo Code Knewton GMAT Discount Codes Veritas Prep GMAT Discount Codes
Manager
Joined: 23 Jan 2006
Posts: 192
Followers: 1

Kudos [?]: 10 [0], given: 0

I got the third one on the GMATPrep too. Must be a typo or wrong answer (the OA is "D", right?).

Frustrating. Hope the real GMAT doesn't have errors in it
VP
Joined: 29 Apr 2003
Posts: 1405
Followers: 2

Kudos [?]: 18 [0], given: 0

How do u solve the first one?
Manager
Joined: 13 Dec 2005
Posts: 224
Location: Milwaukee,WI
Followers: 1

Kudos [?]: 7 [0], given: 0

No way you can solve the 1st one i also got that question when i took the gmatprep it was q no 3 and obviously i had no clue what to do so just guessed something and obviously it was wrong ... i'm sure it would have changed my next question since i got that wrong .
Manager
Joined: 23 Mar 2006
Posts: 76
Followers: 1

Kudos [?]: 1 [0], given: 0

Phew! I was worried about these. Guys, what about the second question?
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5078
Location: Singapore
Followers: 22

Kudos [?]: 183 [0], given: 0

2) If x is positive, is x>3?

a) (x-1)^2>4
b) (x-1)^2>9

St1:
(x-1)^2 - 4 > 0
(x-1+2)(x-1-2) > 0
(x+1)(x-3) > 0

x is valid for x < -1 or x > 3. Insufficient.

St2:
(x-1)^2 - 9 > 0
(x-1+3)(x-1-3) > 0
(x+2)(x-4) > 0

x is valid for x < -2 or x > 4. Insufficient.

Using St1 and St2:

x is valid for x < -1 or x > 3. Insufficient.

Ans E
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5078
Location: Singapore
Followers: 22

Kudos [?]: 183 [0], given: 0

3) n, m are positive intergers. What is the remainder when 3^(4n+2) is divided by 10?

a) n=2
b) m=1

3^(4n+2)/10

St1: Even for us to sovle and find the remainder when divided by 10
St2: knowing m is useless as we do not have the variable m in the equation.

Ans A
Intern
Joined: 14 Apr 2006
Posts: 16
Location: london
Followers: 0

Kudos [?]: 0 [0], given: 0

[quote="ywilfred"]2) If x is positive, is x>3?

a) (x-1)^2>4
b) (x-1)^2>9

St1:
(x-1)^2 - 4 > 0
(x-1+2)(x-1-2) > 0
(x+1)(x-3) >

Solving the first satement you get x<-1or x>3
The Question gives you the information that x is positive so x cant be less than -1 so x>3.
solving second equation x<-2 or x>4
but x cant be <-2 because x is positive so x>4
so in my opinion each statement answers the question
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5078
Location: Singapore
Followers: 22

Kudos [?]: 183 [0], given: 0

fighter wrote:
ywilfred wrote:
2) If x is positive, is x>3?

a) (x-1)^2>4
b) (x-1)^2>9

St1:
(x-1)^2 - 4 > 0
(x-1+2)(x-1-2) > 0
(x+1)(x-3) >

Solving the first satement you get x<-1or x>3
The Question gives you the information that x is positive so x cant be less than -1 so x>3.
solving second equation x<-2 or x>4
but x cant be <-2 because x is positive so x>4
so in my opinion each statement answers the question

ah yes !! I missed the positive part. Thanks for pointing that out, your reasoning is correct.
Manager
Joined: 23 Mar 2006
Posts: 76
Followers: 1

Kudos [?]: 1 [0], given: 0

Thanks guys, OA is D.

Can you please tell me exactly when the inequality sign flips? I thought it was only when both sides are multiplied or divided by a negative number. Here are are subtracting, then why are we flipping the sign
Manager
Joined: 20 Nov 2004
Posts: 108
Followers: 0

Kudos [?]: 2 [0], given: 0

ywilfred wrote:
3) n, m are positive intergers. What is the remainder when 3^(4n+2) is divided by 10?
St2: knowing m is useless as we do not have the variable m in the equation.

Ans A

Question 3):

Consider the questions where they ask about the units digit of a product
of powers.

3^1 = 3 (mod 10)
3^2 = 9 (mod 10)
3^3 = 7 (mod 10)
3^4 = 1 (mod 10)
3^5 = 3 (mod 10)
3^6 = 9 (mod 10)
3^7 = 7 (mod 10)
3^8 = 1 (mod 10)
and so on.

So 3^(4n+2) = 9 (mod 10), no matter what n.

But it's the only question in DS I ever saw where the
answer could be given without any of the two statements.
This one was apparently meant to confuse us and choose A.
Manager
Joined: 23 Mar 2006
Posts: 76
Followers: 1

Kudos [?]: 1 [0], given: 0

Guys the OA for Question 3 is B! That's the surprising bit. I had marked A as well.
Manager
Joined: 20 Nov 2004
Posts: 108
Followers: 0

Kudos [?]: 2 [0], given: 0

Loner wrote:
Guys the OA for Question 3 is B! That's the surprising bit. I had marked A as well.

Well that's certainly not true, cause if n=2, the remainder can easily
determined since no variable is left.
Similar topics Replies Last post
Similar
Topics:
if xy=1, what is the value of 2(x+y)^2/2(x-y)^2 a.2 b.4 c.8 9 12 Jul 2008, 09:46
if xy=1, what is the value of 2(x+y)^2/2(x-y)^2? A. 2 B. 4 4 16 Feb 2007, 16:07
If xy=1, what is the value of 2^(x+y)^2/2(x-y)^2? A) 2 B) 4 1 05 Nov 2006, 16:24
if XY=1, then what is (2*(x+y)^2) / (2*(x-y)^2) a) 2 b) 4 c) 13 10 Nov 2005, 16:10
XY = 1, What is the value of 2(X+Y)^2 / 2(X-Y)^2 a)2. b)4. 6 22 Jul 2005, 21:32
Display posts from previous: Sort by