I. All wheeled conveyances that travel on the highway are : GMAT Critical Reasoning (CR)
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I. All wheeled conveyances that travel on the highway are

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Director
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I. All wheeled conveyances that travel on the highway are [#permalink]

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24 May 2005, 16:49
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I. All wheeled conveyances that travel on the highway are polluters
II. Bicycles are not polluters.
III. Whenever I drive my car on the highway, it rains.
IV. It is raining

The conclusion "my car is not polluting" could be logically deduced from statements I & IV if statement

A. II were changed to "Bicycles are polluters".
B. II were changed to "My car is a polluter"
C. III were changed to "If bicycles were polluters, I would be driving my car on the highway".
D. IV were changed to "Rainwater is polluted".
E. IV were changed to "It is not raining"
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Director
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24 May 2005, 18:48
I think E is the answer....Here I assumed that the 4 choices in sequence (in the premise) should cocnclude that "My car is not polluting"

E IV were changed to "It is not raining"..... then the sequence I through IV is

I. All wheeled conveyances that travel on the highway are polluters
II. Bicycles are not polluters.
III. Whenever I drive my car on the highway, it rains.
IV "It is not raining"

Since it is not raining I am not driving my car which means "My car is not polluting"
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24 May 2005, 19:06

The only way the car is not polluting is by not driving, which always happens when it is not raining.
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krish

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24 May 2005, 20:44
E. also like IV.
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24 May 2005, 21:11
it's a good question though.
I think it's E.gmat2me has a good reasoning,if it's not raining i'm not driving,therefore,my car is not polluting.
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24 May 2005, 22:03
E.
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24 May 2005, 23:24
Interesting question, I haven't seen anything like that before.
I would risk D here 'Rainwater is polluted'

The fact that bicycles are wheeled conveyances and are not polluters casts doubt that all wheeled conveyances on the highway are polluters if a bicycle gets on a highway. Therefore something else may cause the pollution - the rainwater. So when I get on a highway and it rains, there is a chance my car is not polluting (like bicycles).

The problem with E imo and C for that matter is the following
'All wheeled conveyances that travel on the highway are polluters' doesn't necessarily mean that all polluters drive on a highway. So if it's raining it does mean that I am not driving on a highway. But the fact that I am not on highway doesn't mean I don't pollute.

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25 May 2005, 04:23
E)...whenever i drive my car on the highway it rains = when it rains not i dont drive my car on the highway.
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25 May 2005, 07:50
E for me too.

GA
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25 May 2005, 08:44
christoph wrote:
E)...whenever i drive my car on the highway it rains = when it rains not i dont drive my car on the highway.

Liked it......Very good way to approach these type of questions
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25 May 2005, 09:11
Chris, good stuff...
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25 May 2005, 18:38
A question: how would you refute C then?
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25 May 2005, 19:33
sparky wrote:
A question: how would you refute C then?

See the last option ....It rains...would not fit in the sequence...It would be the odd man......

The sequecne would be like this

All wheeled conveyences on highway are polluters

Bicycles aint

If Bicycles are polluters I would not ride on my car on interstate

It rains

It rains isnt connected at all...So C is ruled out
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25 May 2005, 20:36
gmat2me2 wrote:
sparky wrote:
A question: how would you refute C then?

See the last option ....It rains...would not fit in the sequence...It would be the odd man......

The sequecne would be like this

All wheeled conveyences on highway are polluters

Bicycles aint

If Bicycles are polluters I would not ride on my car on interstate

It rains

It rains isnt connected at all...So C is ruled out

Thanks, this type of question is completely new to me.
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25 May 2005, 20:38

First, it wants you to draw your conclusion from I & IV. That means, II and III are not supposed to play any role in the logical deduction here.

Second, no option in the provided list would enable you to draw that conclusion, even if you consider all statements from I to IV.

I. All wheeled conveyances that travel on the highway are polluters
II. Bicycles are not polluters.

(Here I and II contradict each other.)
Quote:
III. Whenever I drive my car on the highway, it rains.
IV. It is raining

III and IV says nothing.

Quote:
A. II were changed to "Bicycles are polluters".

Now I and II are consistent. But III and IV still suggest nothing. You cannot deduce that I am driving my car on the highway because it is raining. Remember, If A then B doens't mean If B then A. But it doesn't mean I'm not driving my car on the highway either. If A then B doesn't mean if B then not A. Further, even if I'm not driving my car on the highway, it doesn't mean my car is not poluting. I only said that a car on the highway would be poluting, but a car not on the highway could be poluting too, we don't know from the premises given. There's no way you can deduce "my car is not poluting" from here.

Quote:
B. II were changed to "My car is a polluter"

By the same reasoning, II would be consistent with I, but there's no way you can get to the conclusion.

Quote:
C. III were changed to "If bicycles were polluters, I would be driving my car on the highway".

II says bikes are not polluters. III says if they are then I would be driving my car on the highway. But if they are not I may or may not be driving my car on the highway. And if I am not driving my car on the highway, it may or may not be polluting. Again, can't get to the conclusion.

Quote:
D. IV were changed to "Rainwater is polluted".

This has nothing to do with anything.

Quote:
E. IV were changed to "It is not raining"

If I drive my car on the highway it rains. If I don't drive my car on the highway, it may or may not rain. It is not raining, it must be that I am not driving on the highway. However, again, if I'm not driving my car on the highway, it may or may not be polluting.
[/quote]

I would like to know the source of this question. Whoever wrote this question, his logic is seriously messed up. Don't buy his/her books, ever!!!
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25 May 2005, 20:40

http://www.gmatclub.com/phpbb/viewtopic.php?t=14547
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25 May 2005, 20:40
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