Discussion
Fact 1 : All chickens are birds.
Fact 2 : Some chickens are hens.
Fact 3 : Female birds lay eggs.
If the first three statements are facts, which of the following statement/(s) must also be a fact ?
I. All birds lay eggs.
II. Hens are birds.
III. Some chickens are not hens.
Choose the correct answer from the options given below :
Answer: B
The key accepts Only II and III.
Statement II holds: hens are female chickens, and all chickens are birds, so hens are birds. Statement I fails, because only female birds are said to lay eggs. Statement III is read in the ordinary sense of the word "some": saying that some chickens are hens suggests that others are not, and the Commission's key takes it that way.
Note that under a strictly formal reading, "some" only means at least one, and then III would not be forced, which would leave Only II. The key follows the everyday reading, which is how this set is meant to be answered.
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