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Instructions
Each of the following questions is based on a set of propositions I-IV. Select the best answer to each question.
I. All Ps are Q.
II. Some Ps are not Q.
III. Some, but not all, Ps are Q.
IV. No Ps are Q.
Question 120
Considered only by themselves, all of the followind pairs of statements might both be false but could not both be true except
