Question

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

• 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 B if only conclusion II follows.

There are two cases possible.

All graphite are diamond.

So, this is a possibility not always correct.

All coal are graphite.

So, this is always true.

Thus only conclusion II is correct.

Hence, Option B is correct.