Question

In each of the questions below are given four 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 parrots are pigeons.
Some crows are pigeons.
Some sparrows are crows.
All sparrows are koels.

Conclusions
I. Some koels are crows.
II. Some parrots are crows.
III. Some sparrows are pigeons.
IV. No crow is a parrot.

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

Answer 1

The correct option is C Only I and either II or IV follow

Mediate term of the following statements is Some sparrows are crows
All sparrows are koels.
Due to alignments property we convert
Some sparrows are crows

Conversion
Some crows are sparrows
Now, the mediate term is
Some crows are sparrows (I-type)
All sparrows are Koels (A-type)
$I+A\to I-type$
Some crows are koels.

Conversion Some koels are crows
(Conclusion I follows)
or

Either II or IV and I follows.