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# Exterminator: Using poisoned food is the most effective tactic for com

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Exterminator: Using poisoned food is the most effective tactic for com  [#permalink]

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12 Jul 2018, 07:56
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5
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Difficulty:

55% (hard)

Question Stats:

58% (01:46) correct 42% (01:57) wrong based on 376 sessions

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Exterminator: Using poisoned food is the most effective tactic for combating a mouse infestation.The mouse will carry the food back to the nest, causing all of the mice to die, while a trap will kill only the one mouse that falls into it. If all signs of the mice disappear for three consecutive weeks after poisoned food is used, the homeowner can be sure that the poison was successful in eradicating the mice.

Which of the following, if true, most seriously calls into question the exterminator’s claim that the absence of signs for three weeks means the mice have been eradicated by the poison?

(A) Because mice hide whenever they sense humans, it is very difficult to see or hear mice even when there is an active infestation.
(B) It is more humane to use “live-catch” traps that allow homeowners to release the still- living mice outside.
(C) In the spring, many mice that nest in houses begin foraging for food outside and do not return to the comfort of the house until the fall or winter.
(D) There are several different kinds of poison that could be used, some of which are more effective than others.
(E) It sometimes takes longer than three weeks for all of the mice to ingest and die from the poison.

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Re: Exterminator: Using poisoned food is the most effective tactic for com  [#permalink]

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12 Jul 2018, 08:14
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+1 for C.

carcass wrote:
Exterminator: Using poisoned food is the most effective tactic for combating a mouse infestation.The mouse will carry the food back to the nest, causing all of the mice to die, while a trap will kill only the one mouse that falls into it. If all signs of the mice disappear for three consecutive weeks after poisoned food is used, the homeowner can be sure that the poison was successful in eradicating the mice.

Weakener :
What if the mouse does not return back to its nest soon enough to "cause all of the mice to die", that way the plan may fail miserably.

(C) In the spring, many mice that nest in houses begin foraging for food outside and do not return to the comfort of the house until the fall or winter. --> Correct, matches our pre-thinking

Hence, C.
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Re: Exterminator: Using poisoned food is the most effective tactic for com  [#permalink]

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26 Aug 2018, 01:37

Why is A incorrect?. If mice hide whenever they sense humans and it is very difficult to see or hear mice, why can't it be a weakener?
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Re: Exterminator: Using poisoned food is the most effective tactic for com  [#permalink]

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26 Aug 2018, 02:05
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The stem says

Quote:
If all signs of the mice disappear

A) talks about only to see or hear the mice of disappearing. We need that all the signs are gone such as food rests, droppings and so forth.

Moreover, in general, mice are always difficult to see or hear. So A) is wrong for these reasons.

Hope now is clear
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Exterminator: Using poisoned food is the most effective tactic for com  [#permalink]

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30 Aug 2018, 11:42
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This question is from GRE Practice Problems. The explanation the book has is:

6. (C). The exterminator explains the effects of using poisoned food to combat a mouse infestation: mice will pick up the food an carry it to the nest, where all of the mice will eat the food and die as a result. The exterminator then claims that if X happens, then it will be certain that Y happened first. Specifically, he claims that if all signs of the mice disappear for three consecutive weeks after setting out poisoned food, then the mice all must have died as a result of that poisoned food. The correct answer will weaken this claim, for instance by showing that if X happens, it will not necessarily mean that Y happened; perhaps there is another reason why happens.

(A): this choice is very tempting, but the exterminator argues that "all signs" of the mice "disappear"; this choice mentions only the difficulty of seeing and hearing mice. These do not represent "all signs" of an infestation; mice may leave dropping, chew things up, and so forth. Further, the mice are not harder to see and hear only after poison has been used. They are always hard to see and hear, so this does not provide an alternative explanation as to why signs might diminish or disappear after poison has been used.

(B): this choice may be true, but it does not address the exterminator's claim that if all signs disappear, then the poison must have killed the mice.

(C): CORRECT. This choice offers an alternative explanation for absence of signs of an infestation. If the mice have left the house, then any signs of infestation would also cease because the mice are no longer there. However, the signs will have ceased because the mice left voluntary, not because they have been eradicated by the poison, as claimed by the exterminator.

(D): it is likely true that different poisons have different levels of efficacy, but this argument does not distinguish between types of poison. The claim is simply that the poison must have killed the mice (as opposed to some other explanation for why the signs of the mice would disappear).

(E): The exterminator does not claim that the poison will work within three weeks (or within any time frame at all). He only claims that if the signs disappear over three consecutive weeks, then that means that the poison worked. It might be the case that the signs don't disappear until weeks 3, 4, or 5, but the exterminator's claim would still hold: because the signs have disappeared for three consecutive weeks, the poison worked.
Exterminator: Using poisoned food is the most effective tactic for com   [#permalink] 30 Aug 2018, 11:42
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