Question

1.All chickens are birds.
2. Some chickens are hens.

3. Female birds lay eggs.

If the above three statements are facts, which of the following statement must also be a fact?

I. All birds lay eggs.

II. Some hens are birds.

III. Some chickens are not hens.

1. II Only
2. II and III only
3. I, II and III
4. None of the statements is known as fact.

Answer 1

Correct Answer - Option 1 : II Only

Given statements -

1.All chickens are birds.
2. Some chickens are hens.

3. Female birds lay eggs.

Conclusions :

1. All birds lay eggs → False(Only Female birds lay eggs is given in the statement)

2. Some hens are birds → True(Some hens are chickens and all chickens are birds so, some hens are birds is definitely true)

3. Some chickens are not hens → False(Not condition is not given in the statement so, It is possible but not definite)

Hence, 'II Only' is the correct answer.