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?

• A. All birds lay eggs
• B. Some Hens are birds
• C. Some chickens are not hens

Answer 1

The correct option is C

Some chickens are not hens

Analyse the given facts and conclusions

Explanation for (I)

Only female birds lay eggs so the statement (I) is not true.

So, option A is incorrect.

Explanation for (II)

All chickens are birds and some chickens are hens. Hence all hens are birds.

So, statement (II) is not true.

So, option B is incorrect.

Explanation for (III)

Some chickens are hens implies some chickens are not hens.

So, statement (III) is true.

So, option C is correct.

Hence, the correct option is C.