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few princeton review DS questions from 2nd ed math workout

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coachy Newbie | Next Rank: 10 Posts Default Avatar
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11 Feb 2007
Posted:
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few princeton review DS questions from 2nd ed math workout

Post Mon Feb 19, 2007 2:25 pm
On Page 222 they have thus DS question
Is it true that X < Y?
1 5x < 5y
2 zx < zy

I thought the answer should be D. They say it is A.
Explaination is that in second statement Z could be +ve or -ve.

I chose D because we are already given zx < zy. Isn't it true that we have to assume that statement 2 is true.


Similarly on page 223

the question is
If X and Y are integers, does x = y?
1) xy = y2 (2 here is square)
2) x2 = y2 (2 here is square)

I thought the answer should be again D but the book says it is C.

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kandelaki Senior | Next Rank: 100 Posts Default Avatar
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Post Tue Feb 20, 2007 10:46 pm
you're right.
I guess it just about z being positve or negative, nothing to do with 0.
thanks

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coachy Newbie | Next Rank: 10 Posts Default Avatar
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Post Tue Feb 20, 2007 7:53 am
if we assume z = 0 even the 2nd statement would not be true...

zx < zy

tells us that z cannot be 0.

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kandelaki Senior | Next Rank: 100 Posts Default Avatar
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Posted:
37 messages
Post Tue Feb 20, 2007 10:46 pm
you're right.
I guess it just about z being positve or negative, nothing to do with 0.
thanks

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coachy Newbie | Next Rank: 10 Posts Default Avatar
Joined
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Posted:
3 messages
Post Tue Feb 20, 2007 7:53 am
if we assume z = 0 even the 2nd statement would not be true...

zx < zy

tells us that z cannot be 0.

_________________
gogmat

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