Q98
Statements : All pencils are birds. All birds are skies. All skies are hills. Conclusions : I. All pencils are hills. II. All hills are birds III. All skies are pencils. IV. All birds are hills.
A.
Only I and II follow
B.
Only I and III follow
C.
Only III and IV follow
D.
All follow
E.
None of these
AnswerAnswer: Option E
Solution
Answer: Option E
Solution:
All pencils are birds. All birds are skies.Since both the premises are universal and affirmative, the conclusion must be universal affirmative (A-type) and should not contain the middle term. So, it follows that 'All pencils are skies'.
All birds are skies. All skies are hills.
As discussed above, it follows that 'All birds are hills'. Thus, IV follows.
All pencils are skies. All skies are hills.
Clearly, it follows that 'All pencils are hills'. Thus, I follows. Hence, I and IV follow.