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Question

In each of the questions below are given three statements followed by four conclusions numbered I, II, III and IV.
You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
All trucks are vans.
All vans are cars.
All cars are trains.

Conclusions
I. All trains are trucks.
II. All cars are trucks.
III. All trucks are trains.
IV. All vans are trains.


A
All follow
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B
Both I and II follow
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C
Both II and III follow
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D
Both II and IV follows
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E
None of the above
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Solution

The correct option is E None of the above
Mediate term of the following statement is
All trucks are vans (A-type)
All vans are cars (A-type)
A+AAtype
All trucks are cars ........(i)
Another mediate term is
All vans are cars (A-type)
All cars are trains (A-type)
A+AAtype
All vans are trains.........(ii)
(Conclusion IV follows)
From Eq. (i)
All trucks are cars
All cars are trains
All trucks are trains
(Conclusion III follows)

Conclusion III and IV follow.

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