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# A passenger cannot land in Ulan Batur without first landing in Ethiopi

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A passenger cannot land in Ulan Batur without first landing in Ethiopi  [#permalink]

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08 May 2017, 10:58
1
4
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Difficulty:

15% (low)

Question Stats:

77% (01:12) correct 23% (01:20) wrong based on 201 sessions

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A passenger cannot land in Ulan Batur without first landing in Ethiopia. You can land in Ethiopia only if you've landed in Republic.

If the statements above are true, which of the following must also be true?

A) If a passenger landed in Republic, he must also have landed in Ethiopia.

B) If a passenger has not landed in Ethiopia, he must not have landed in Republic.

C) A passenger can land in either Republic or Ethiopia but not both.

D) A passenger who is in Ulan Batur has not landed in Ethiopia.

E) A passenger who has not landed in Republic has not landed in Ulan Batur.

Source: 800Score

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Re: A passenger cannot land in Ulan Batur without first landing in Ethiopi  [#permalink]

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10 May 2017, 02:33
HKD1710 wrote:
A passenger cannot land in Ulan Batur without first landing in Ethiopia. You can land in Ethiopia only if you've landed in Republic.

If the statements above are true, which of the following must also be true?

A) If a passenger landed in Republic, he must also have landed in Ethiopia.

B) If a passenger has not landed in Ethiopia, he must not have landed in Republic.

C) A passenger can land in either Republic or Ethiopia but not both.

D) A passenger who is in Ulan Batur has not landed in Ethiopia.

E) A passenger who has not landed in Republic has not landed in Ulan Batur.

Source: 800Score

IMO E

If you have not landed in Republic than you cannot land in Ethiopia and if you have not landed in Ethiopia then you cannot land in Ulan Batur.
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Re: A passenger cannot land in Ulan Batur without first landing in Ethiopi  [#permalink]

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27 Sep 2017, 23:03
Hello Experts,

This looks like a 'Necessary' and 'sufficient' condition question to be as explained in Power score CR. Am I correct in my understanding?

HKD1710 wrote:
A passenger cannot land in Ulan Batur without first landing in Ethiopia. You can land in Ethiopia only if you've landed in Republic.

If the statements above are true, which of the following must also be true?

A) If a passenger landed in Republic, he must also have landed in Ethiopia.

B) If a passenger has not landed in Ethiopia, he must not have landed in Republic.

C) A passenger can land in either Republic or Ethiopia but not both.

D) A passenger who is in Ulan Batur has not landed in Ethiopia.

E) A passenger who has not landed in Republic has not landed in Ulan Batur.

Source: 800Score

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Re: A passenger cannot land in Ulan Batur without first landing in Ethiopi  [#permalink]

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14 Jan 2019, 15:23
Please anyone help me explain why it is not B?
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A passenger cannot land in Ulan Batur without first landing in Ethiopi  [#permalink]

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06 Feb 2019, 02:35
yenngoc2409 wrote:
Please anyone help me explain why it is not B?

HKD1710 wrote:
A passenger cannot land in Ulan Batur without first landing in Ethiopia. You can land in Ethiopia only if you've landed in Republic.

If the statements above are true, which of the following must also be true?

B) If a passenger has not landed in Ethiopia, he must not have landed in Republic.

Source: 800Score

yenngoc2409 From the stimulus, we know two things: 1) If a passenger landed in Ulan Batur, then they landed in Ethiopia and 2) If a passenger landed in Ethiopia, then they landed in Republic. B incorrectly assumes that just because a passenger did not land in Ethiopia, it is impossible for him/her or "must not have" landed in the Republic. However, it's possible that he/she landed in the Republic without having gone to Ethiopia at all. Maybe we went to the North Pole first... Therefore, this statement is a possibility but not a definitive truth. (According to the Powerscore method, this would be considered a "mistaken negation".)

The negation concept is probably easier to understand outside of this context...because this whole country/region thing is confusing! For example, let's say that the original statement was: If you eat 5 pies, then you'll be sent to the hospital. If we negate this (the way B does with the original post), it'd say: If you did not eat 5 pies, then you must not have been sent to the hospital. Logically speaking, this looks "in line" with the original statement but is negated and makes 0 sense. Just because I didn't eat 5 pies, doesn't mean I didn't go to the hospital. What about getting sick? Visiting a friend?
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A passenger cannot land in Ulan Batur without first landing in Ethiopi   [#permalink] 06 Feb 2019, 02:35
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