Question

In each of the questions below are given four statements followed by three conclusions numbered I, II, and III. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.​​​​​​​

Statements
All bricks are stones.
Some stones are rocks.
All rocks are mountains.

Conclusions
I. Some mountains are stones.
II. Some mountains are bricks.
III. Some stones are bricks.

• A. Only I follows
• B. Only III follows
• C. Both I and III follows
• D. All follows
• E. None of the above

Answer 1

The correct option is C Both I and III follows

All bricks are stones (A-type)
Inference some bricks are stones
conversion some stones are bricks
(Conclusion III follows)
2. Some stones are rocks (I-type)
Conversion some rocks are stones
3. All rocks are mountains (A-type)
Inference some rocks are mountains
Conversion some mountains are rocks
Mediate inference in statement (2) and (3)
Some stones are rocks (I - type)
All rocks are mountains (A-type)
$I+A\to Itype$
4. Some stones are mountains
Conversion some mountains are stones
(Conclusion I follows)