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An editor is compiling a textbook containing essays by several differe

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An editor is compiling a textbook containing essays by several differe  [#permalink]

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New post 12 Nov 2019, 17:14
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A
B
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D
E

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  45% (medium)

Question Stats:

64% (01:37) correct 36% (02:04) wrong based on 120 sessions

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An editor is compiling a textbook containing essays by several different authors. The book will contain essays by Lind, Knight, or Jones, but it will not contain essays by all three. If the textbook contains an essay by Knight, then it will also contain an essay by Jones.

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

(A) If the textbook contains an essay by Lind, then it will not contain an essay by Knight.
(B) The textbook will contain an essay by only one of Lind, Knight, and Jones.
(C) The textbook will not contain an essay by Knight.
(D) If the textbook contains an essay by Lind, then it will also contain an essay by Jones.
(E) The textbook will contain an essay by Lind.

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An editor is compiling a textbook containing essays by several differe  [#permalink]

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New post 14 Nov 2019, 10:50
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If the textbook contains an essay by Knight, then it will also contain an essay by Jones.
Translated into: have Knight MUST have Jones
=> have Knight MUST NOT have Lind (because the textbook will not contain essays by all three). Lind & Knight cannot co-exist.
So A is correct.

D is not correct because it is just one possibility. We can have a textbook containing essays by Lind but not containing any essay by Jones.

(I welcome any feedback on my thoughts)

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Re: An editor is compiling a textbook containing essays by several differe  [#permalink]

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New post 20 Nov 2019, 08:36
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Akela wrote:
An editor is compiling a textbook containing essays by several different authors. The book will contain essays by Lind, Knight, or Jones, but it will not contain essays by all three. If the textbook contains an essay by Knight, then it will also contain an essay by Jones.

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

(A) If the textbook contains an essay by Lind, then it will not contain an essay by Knight.
(B) The textbook will contain an essay by only one of Lind, Knight, and Jones.
(C) The textbook will not contain an essay by Knight.
(D) If the textbook contains an essay by Lind, then it will also contain an essay by Jones.
(E) The textbook will contain an essay by Lind.


Book wont have all 3. L/K/J
If K --->J

That means if I include K then J will be included. But I won't have all 3 together.

Based on responses:

(A) If the textbook contains an essay by Lind, then it will not contain an essay by Knight.
So If I pick L, I can't pick K. Why? Because if I have L and I pick K I will have to include J. That means I will have all 3. So this must be true.


(D) If the textbook contains an essay by Lind, then it will also contain an essay by Jones.
If I pick L then I may or may not pick J. There is no relation defined here. I can only include L and live happily. So this is not true.
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Re: An editor is compiling a textbook containing essays by several differe   [#permalink] 20 Nov 2019, 08:36
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