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Question

Statements: Some hills are rivers. Some rivers are deserts. All deserts are roads.
Conclusions:
I. Some roads are rivers.
II. Some roads are hills.
III. Some deserts are hills.

A
None follows
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B
Only I follows
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C
Only I and II follow
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D
Only II and III follow
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E
All follow
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Solution

The correct option is B Only I follows
Some hills are rivers. Some rivers are deserts.
Since both the premises are particular, no definite conclusion follows.
Some rivers are deserts. All deserts are roads.
Since one premise is particular, the conclusion must be particular and shouldn't contain the middle term. So, it follows that 'Some rivers are roads'. I is the converse of this conclusion and so it holds.
Some hills are rivers. Some rivers are roads.
Again, since both the premises are particular, no definite conclusion follows.

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