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# Nearly all mail that is correctly addressed arrives at its

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Manager
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Nearly all mail that is correctly addressed arrives at its [#permalink]

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19 Apr 2009, 05:13
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Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?
A) A large proportion of the mail that is correctly addressed is damaged in transit.
B) No incorrectly addressed mail arrives within two business days of being sent.
C) Most mail that arrives within two business days of being sent is correctly addressed.
D) A large proportion of mail is incorrectly addressed.
E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent.

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Senior Manager
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Re: CR : LSAT : mails [#permalink]

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19 Apr 2009, 10:38
Hi mates,

IMO D (althoug I have doubts with C)

the point is that almost all the mail that is correctly addressed arrives at its destination within 2 business days, and if not, it's because the mail has been damaged.

However, most mail arrives within 3 business days or more.

That means that a large proportion of mail is wrongly addressed or if it is correctly addressed it has been damaged.

A out: because it doesn't count the mail that is wrongly addressed
B out: it's an extreme answer
C out: it is a premise
E out: there is no reason to think in the interval between 2 and 3 days

OA?

Thanks
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Director
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Re: CR : LSAT : mails [#permalink]

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19 Apr 2009, 16:40
D

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Re: CR : LSAT : mails [#permalink]

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19 Apr 2009, 22:51
D

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Re: CR : LSAT : mails [#permalink]

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20 Apr 2009, 04:08
I see either "A" or "D" as the correct answer.
Can you post the OA & OE?

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Re: CR : LSAT : mails [#permalink]

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20 Apr 2009, 05:04
C. OA?
gmatavenue wrote:
Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?
A) A large proportion of the mail that is correctly addressed is damaged in transit.
B) No incorrectly addressed mail arrives within two business days of being sent.
C) Most mail that arrives within two business days of being sent is correctly addressed.
D) A large proportion of mail is incorrectly addressed.
E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent.

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Current Student
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Re: CR : LSAT : mails [#permalink]

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21 Apr 2009, 14:40
A.

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Manager
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Re: CR : LSAT : mails [#permalink]

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21 Apr 2009, 18:19
IMO D

Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?
A) A large proportion of the mail that is correctly addressed is damaged in transit --> no info about this. The argument state that a large proportion of mail, not a large proportion of correctly addressed mail, arrives in 3 or more days
B) No incorrectly addressed mail arrives within two business days of being sent --> no info about this
C) Most mail that arrives within two business days of being sent is correctly addressed wrong, we can conclude that all, not most, mails arrive in 2 business days are correctly addressed mails
D) A large proportion of mail is incorrectly addressed --> true, the argument states that most mail arrives within 3 days or more, so most mail must be incorrect mail or correct mail but damaged transit, but the premise stating that mail correctly addressed but damaged transit is minority, so most mail must be incorrect addressed mail
E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent -->counterfact

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Senior Manager
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Re: CR : LSAT : mails [#permalink]

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21 Apr 2009, 22:53
C for me...

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Re: CR : LSAT : mails [#permalink]

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22 Apr 2009, 13:57
I go with C.

Premise1 : Nearly all mail correctly address arrives within 2 days
Premise2: Arrive in more than 2 days when damaged
Conclusion: Most mail arrive in 3 days

D) A large proportion of mail is incorrectly addressed
- How do we know it's not because the mail is damaged?

C) Most mail that arrives within two business days of being sent is correctly addressed
- This agrees with the premise1.

Minheequang wrote:
IMO D

Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?
A) A large proportion of the mail that is correctly addressed is damaged in transit --> no info about this. The argument state that a large proportion of mail, not a large proportion of correctly addressed mail, arrives in 3 or more days
B) No incorrectly addressed mail arrives within two business days of being sent --> no info about this
C) Most mail that arrives within two business days of being sent is correctly addressed wrong, we can conclude that all, not most, mails arrive in 2 business days are correctly addressed mails
D) A large proportion of mail is incorrectly addressed --> true, the argument states that most mail arrives within 3 days or more, so most mail must be incorrect mail or correct mail but damaged transit, but the premise stating that mail correctly addressed but damaged transit is minority, so most mail must be incorrect addressed mail
E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent -->counterfact

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Manager
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Re: CR : LSAT : mails [#permalink]

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22 Apr 2009, 19:32
I go with C.

Premise1 : Nearly all mail correctly address arrives within 2 days
Premise2: Arrive in more than 2 days when damaged
Conclusion: Most mail arrive in 3 days

D) A large proportion of mail is incorrectly addressed
- How do we know it's not because the mail is damaged? --> not understand what you wanna talk about

C) Most mail that arrives within two business days of being sent is correctly addressed
- This agrees with the premise1 -->wrongly agree. Nearly all mails correctly addressed arrive within 2 days, not nearly all mails arrive within 2 days are correctly addressed mails. Besides, we all can comprehend that incorrect mails can't arrive at the right destination within 2 days. So, we can infer that all mails arrive within 2 days are correctly addressed mails (not matter what it is damaged or not damaged transit
[/color]

Minheequang wrote:
IMO D

Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?
A) A large proportion of the mail that is correctly addressed is damaged in transit --> no info about this. The argument state that a large proportion of mail, not a large proportion of correctly addressed mail, arrives in 3 or more days
B) No incorrectly addressed mail arrives within two business days of being sent --> no info about this
C) Most mail that arrives within two business days of being sent is correctly addressed wrong, we can conclude that all, not most, mails arrive in 2 business days are correctly addressed mails
D) A large proportion of mail is incorrectly addressed --> true, the argument states that most mail arrives within 3 days or more, so most mail must be incorrect mail or correct mail but damaged transit, but the premise stating that mail correctly addressed but damaged transit is minority, so most mail must be incorrect addressed mail
E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent -->counterfact

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Director
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Re: CR : LSAT : mails [#permalink]

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25 Apr 2009, 12:13
OA plz

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Manager
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Re: CR : LSAT : mails [#permalink]

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26 Apr 2009, 02:06
Source @ LSAT PrepTest # 20 : Q 19

OA : D
OE : Our job here is to draw an inference from the several timing statements contained in the
stimulus. Here’s the situation: nearly all mail that’s correctly addressed arrives within two
business days. The only time correctly addressed mail takes more than two business days
is if it is damaged in transit. Overall, however, most mail takes three days or more to get to
its destination. How can we reconcile this last idea with the statement in the first two
sentences? Like this: we must infer that most mail is not correctly addressed, choice (D).
Think about it this way: the correctly addressed mail is a subset of the larger group called
“overall” mail. And if most mail in this larger group takes three business days or more, yet
most of the correctly addressed mail arrives within two business days, then there must be
another group contained in the “overall” mail group that drives the “overall” arrival
number up. The only other group besides “correctly addressed mail” is “incorrectly
addressed mail,” and there must be a lot of it out there if the number in the last sentence is
correct.

(A) can be true, but need not be; so we can cross it off (see bullet point below).
(B) There must be a lot of incorrectly addressed mail taking three business days or more in
order to drive the overall number up, but that doesn’t mean that every incorrectly
addressed piece of mail arrives this late. That is, it is possible for some incorrectly
addressed pieces to arrive within two business days.
(C) Most correctly addressed mail arrives within two business days. We can’t switch this
around and say that most mail arriving within two business days is correctly addressed.
This choice may sound good at first; but if you look at it really hard, you’ll see this is
backwards and therefore cannot be inferred. It’s possible that most mail that shows up
within two business days is incorrectly addressed.
(E) is an overly precise claim that we have no way of verifying from the information in the
passage.
• Continually hone your ability to interpret formal logic statements. The statement
“correctly addressed mail takes longer than two business days to arrive only when it
is damaged in transit” literally means “if correct address and longer than two days,
then damaged.” It doesn’t mean “if damaged, then longer than two days.” Now, you
may have thought that (A) cannot be true, but in fact it can: it’s possible for a large
proportion of correctly addressed mail to be damaged and still to have nearly all
correctly addressed mail arrive within two business days.

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Manager
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Re: CR : LSAT : mails [#permalink]

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28 Oct 2009, 01:24
Minheequang wrote:
IMO D

Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?
A) A large proportion of the mail that is correctly addressed is damaged in transit --> no info about this. The argument state that a large proportion of mail, not a large proportion of correctly addressed mail, arrives in 3 or more days
B) No incorrectly addressed mail arrives within two business days of being sent --> no info about this
C) Most mail that arrives within two business days of being sent is correctly addressed wrong, we can conclude that all, not most, mails arrive in 2 business days are correctly addressed mails
D) A large proportion of mail is incorrectly addressed --> true, the argument states that most mail arrives within 3 days or more, so most mail must be incorrect mail or correct mail but damaged transit, but the premise stating that mail correctly addressed but damaged transit is minority, so most mail must be incorrect addressed mail
E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent -->counterfact

I did not see this fact "the premise stating that mail correctly addressed but damaged transit is minority". Is that because this statement "In fact, correctly addressed mail takes longer than this only when it is damaged in transit" you draw out that?

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Re: CR : LSAT : mails   [#permalink] 28 Oct 2009, 01:24
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