Two statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
Some shells are pebbles.
All pebbles are rocks.
Conclusions:
I. No shell is a rock.
II. Some shells are rocks.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Only Conclusion II follows.
The least possible Venn Diagram for the given statements is drawn below:
Conclusions:
I. No shell is a rock → False (It is possible but no definite conclusion can be drawn.)
II. Some shells are rocks → True (As some shells are pebbles, and all pebbles are rocks, so, some shells are rocks is also true.)