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logic (energy)

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logic (energy) [#permalink] New post 15 Jul 2004, 00:33
In the past century, North America has shifted its main energy source first from wood to coal, then from coal to oil and natural gas. With each transition, the newly dominant fuel has had less carbon and more hydrogen than had its predecessor. It is logical to conclude that in the future the main energy source will be pure hydrogen.

Which one of the following expresses a general principle that could underlie the argument?

(A) If series of transitions from one state of a system to another state of that system is allowed to continue without interference, the initial state of the series will eventually recur.
(B) If each of two desirable attributes belongs to a useful substance, then the most useful form of that substance will have those two attributes in equal amounts.
(C) If the second stage of a process has been completed more quickly than the first stage, the third stage of that process will be completed more quickly than the second stage.
(D) If each step in a series of changes involves a decrease of one attribute of the thing undergoing the change and an increase of another, the series will terminate with the first attribute eliminated and only the second attribute present.
(E) If one substance is better for a certain purpose than another substance is, then the best substance for that purpose is one that includes among its attributes all of the attributes of the first substance and none of the attributes of the second substance.
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 [#permalink] New post 15 Jul 2004, 01:13
D
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 [#permalink] New post 15 Jul 2004, 04:07
Obvious D
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 [#permalink] New post 15 Jul 2004, 04:24
D for me too.

Me thinks its a very simple one
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 [#permalink] New post 15 Jul 2004, 07:09
D is correct
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 [#permalink] New post 15 Jul 2004, 07:19
these are pretty nice questions.

got D.
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 [#permalink] New post 16 Jul 2004, 12:48
agree dj. ETS should look at this question.

D for me as well.
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 [#permalink] New post 16 Jul 2004, 18:30
E.

A,B,C are easy out.

D has no mention about the improvement in each step (in the "dominent fuel").

E explains H is better than C and at the end,H will be 100% and C will be 0% in the fuel.
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 [#permalink] New post 16 Jul 2004, 20:21
D is the one
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 [#permalink] New post 16 Jul 2004, 20:22
D is the one
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 [#permalink] New post 17 Jul 2004, 12:42
what is the OA?
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 [#permalink] New post 17 Jul 2004, 13:14
it is D (as given by Stoylar in the above discussion!)
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 [#permalink] New post 17 Jul 2004, 13:35
Oops.. I did not realize, entered so late.
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  [#permalink] 17 Jul 2004, 13:35
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