Home » Logical Reasoning » Logical Deduction

Statements: Some dogs are rats. All rats are trees. Some trees are not dogs. Conclusions: Some trees are dogs. All dogs are trees. All rats are dogs. No tree is dog.

None follows
Only I follows
Only I and II follow
Only II and III follow
All follow

Correct Answer: Only I follows

Explanation:

Some dogs are rats. All rats are trees.

Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some dogs are trees'. I is the converse of this conclusion and so it holds.

All rats are trees. Some trees are not dogs.

Since the middle term 'trees' is not distributed even once in the premises, no definite conclusion follows.

← Previous Question Next Question→

More Questions from Logical Deduction

Statements: Some bricks are trees. All trees are pens. All pens are boats. Conclusions: Some boats are bricks. Some pens are bricks. Some trees are bricks. Some bricks are boats.
Statements: All cups are glasses. Some glasses are bowls. No bowl is a plate. Conclusions: No cup is a plate. No glass is a plate. Some plates are bowls. Some cups are not glasses.
Statements: Some trains are roads. No road is jungle. All flowers are jungles. Conclusions: Some trains are flowers. Some trains are jungles. Some flowers are trains. No road is flower.
Statements: All doors are buses. All buses are leaves. No leaf is a flower. Conclusions: No flower is a door. No flower is a bus. Some leaves are doors. Some leaves are buses.
Statements: All oceans are rivers. Some springs are rivers. All wells are springs. Conclusions: Some springs are oceans. Some wells are rivers. Some rivers are oceans. No well is river.
Statements: Some tigers are lions. Some lions are rabbits. Some rabbits are horses. Conclusions: Some tigers are horses. Some rabbits are tigers. Some horses are lions. All horses are rabbits.
Statements: Some spoons are bowls. All bowls are knives. All knives are forks. Conclusions: All spoons are forks. All bowls are forks. Some knives are bowls. Some forks are spoons.
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.
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.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion