Self-study
An editor is compiling a textbook containing essays by several different authors. ███ ████ ████ ███████ ██████ ██ █████ ███████ ██ ██████ ███ ██ ████ ███ ███████ ██████ ██ ███ ██████ ██ ███ ████████ ████████ ██ █████ ██ ███████ ████ ██ ████ ████ ███████ ██ █████ ██ ██████
Summary
The stimulus can be diagrammed as follows:
Notable Valid Inferences
If there is an essay by Knight, then there won’t be an essay by Lind.
There can be a maximum of two authors in the textbook.
19.
If the statements above are █████ █████ ███ ██ ███ █████████ ████ ██ █████
a
If the textbook ████████ ██ █████ ██ █████ ████ ██ ████ ███ ███████ ██ █████ ██ ███████
This must be true. As shown in the diagram, Knight and Lind cannot both be included in the textbook. Including Knight means we must also include Jones. This implies that we cannot include Lind, since we cannot include all three authors.
b
The textbook will ███████ ██ █████ ██ ████ ███ ██ █████ ███████ ███ ██████
This could be false. It could be the case that two authors are included in the textbook.
c
The textbook will ███ ███████ ██ █████ ██ ███████
This could be false. The textbook could contain an essay by Knight and Jones.
d
If the textbook ████████ ██ █████ ██ █████ ████ ██ ████ ████ ███████ ██ █████ ██ ██████
This could be false. The textbook could contain an essay by only Lind.
e
The textbook will ███████ ██ █████ ██ █████
This could be false. It could be the case that only Knight and Jones are in the textbook.