Question

In each of the questions below are given three statements followed by four conclusions numbered I, II, III and IV. 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 needles are threads.
All threads are boxes.
All trees are boxes.

Conclusions
I. No needle is a tree.
II. Some trees are threads.
III. Some boxes are needles.
IV. Some trees are needles.

• A. Only either I or IV follows
• B. Only either I or IV and II follow
• C. Only III follows
• D. None follows
• E. Only either I or IV and III follow

Answer 1

The correct option is E Only either I or IV and III follow

Mediate term of the following statements is
All needles are threads (A-type)
All threads are boxes (A-type)
$A+A\to A-type$
All needles are boxes
Conversion
Some boxes are needles
(Conclusion III follows)
Conclusion I or IV are a complementary pair.

Only either I or IV and III follow.