Question

Statements: All coals are diamonds.
All diamonds are graphite.
No graphite is carbon.
Conclusions: I. No coal is carbon.
II. No diamond is carbon.

• A. if only conclusion I follows.
• B. if only conclusion II follows.
• C. if either conclusion I or conclusion II follows.
• D. if neither conclusion I nor conclusion II follows.
• E. if both conclusion I and conclusion II follow.

Answer 1

The correct option is E if both conclusion I and conclusion II follow.

There are two cases possible.

No coal is carbon.

So, this is always true.

No diamond is carbon.

So, this is always true.

Thus both conclusion I and II are correct.

Hence, Option E is correct.