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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!

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 .

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

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.

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

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.

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.