Logical Reasoning

PT124 · S3 · Q19 An editor is compiling

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An editor is compiling a textbook containing essays by several different authors.

The book will contain essays by K + J → ~L Lind, Knight, or Jones, but it will K + L → ~J not contain essays by all three. J + L → ~K

If the textbook contains an K → J essay by Knight, then it will also contain an essay by Jones.

Given that the book can't have all three authors, if we include Knight (and thus have to include Jones), then we definitely won't be including Lind.

That ends up looking like K → ~L or by contrapositive L → ~K

19.

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

Correct
If the textbook contains an
Why this is right
This follows from the 1st K → J and 2nd statements K + J → ~L ⏤⏤⏤⏤⏤⏤⏤ ∴ L → ~K If Lind were one of the two we were picking, then Knight can't be the other one we pick (because when we pick Knight we also have to pick Jones!)
Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.
82% picked this
The textbook will contain an
Too Strong
The textbook could contain entries by both Knight and Jones
3% picked this
The textbook will not contain
Too Strong
The textbook could contain entries by both Knight and Jones
2% picked this
If the textbook contains an
Unsupported Relationship
The textbook could contain an essay by only Lind.
10% picked this
The textbook will contain an
Too Strong
The textbook could contain essays by both Knight and Jones, but not Lind.
4% picked this

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