Question

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 statements must also be a fact?
I: All birds lay eggs.
II: Some Hens are birds.
III: Some chickens are not hens.

Answer 1

The first statement cannot be a fact because only female birds lay eggs.

Statement II is a fact because some hens are chickens and all chickens are birds.

Statement III is also true since if only some chickens are hens, then there are some chickens which must not be hens.

Answer 2

The given facts are :

Fact 1: All chickens are birds.
Fact 2: Some chickens are hens.
Fact 3: Female birds lay eggs.

The answer will be II: Some Hens are birds.