Home » Logical Reasoning » Logical Deduction

Statements: All pencils are birds. All birds are skies. All skies are hills. Conclusions: All pencils are hills. All hills are birds All skies are pencils. All birds are hills.

Only I and II follow
Only I and III follow
Only III and IV follow
All follow
None of these

Correct Answer: None of these

Explanation:

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.

← Previous Question Next Question→

More Questions from Logical Deduction

Statements: No tree is fruit. All fruits are stones. All stones are rains. Conclusions: No stone is tree. No rain is tree. Some rains are fruits. Some rains are trees.
Statements: All players are spectators. Some spectators are theatres. Some theatres are dramas. Conclusions: Some dramas are spectators. Some players are dramas. Some theatres are players. All spectators are players.
Statements: All doors are roads. No road is fruit. Some flowers are doors. Conclusions: Some fruits are doors. Some fruits are flowers. Some roads are flowers. No fruit is flower.
Statements: All needles are threads. All threads are boxes. All trees are boxes. Conclusions: No needle is tree. Some trees are threads. Some boxes are needles. Some trees are needles.
Statements: No house is school. All colleges are schools. All schools are teachers. Conclusions: No house is teacher. All colleges are teachers. Some teachers are not houses. No college is house.
Statements: Some pearls are stones. Some stones are diamonds. No diamond is a gem. Conclusions: Some gems are pearls. Some gems are diamonds. No gem is a diamond. No gem is a pearl.
Statements: All rods are bricks. Some bricks are ropes. All ropes are doors. Conclusions: Some rods are doors. Some doors are bricks. Some rods are not doors. All doors are ropes.
Statements: All myths are fictions. No fiction is novel. All novels are stories. Conclusions: No myth is novel. Some fictions are novels. Some fictions are myths. Some myths are novels.
Statements: No paper is pen. No pen is pencil. All erasers are papers. Conclusions: Some papers are erasers. No pencil is eraser. No pen is eraser. All papers are erasers.
Statements: No man is sky. No sky is road. Some men are roads. Conclusions: No road is man. No road is sky. Some skies are men. All roads are men.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion