Statements : Some dogs are rats. All rats are trees. Some trees are not dogs. Co

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Statements : Some dogs are rats. All rats are trees. Some trees are not dogs.
Conclusions :
I. Some trees are dogs.
II. All dogs are trees.
III. All rats are dogs.
IV. No tree is dog.

Answer: Option B
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.

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