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Question

In each question below are given two statements followed by two conclusions numbered I and II. You have to take the two given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follows from the two given statements, disregarding commonly known facts. Give Answer:

Statements: Some oils are petrol.

                            All diesels are oils.

Conclusions: I. All diesels being petrol is a possibility.

                       II. Some oils are not diesels.

A if only conclusion I follows. Correct Answer Incorrect Answer
B if only conclusion II follows. Correct Answer Incorrect Answer
C if either conclusion I or II follows. Correct Answer Incorrect Answer
D if neither conclusion I nor II follows. Correct Answer Incorrect Answer
E if both conclusions I and II follow Correct Answer Incorrect Answer

Solution

All diesels are oils (A) + Some oils are petrol (I) ⇒ Probable conclusion ⇒ All diesels may be petrol(A). Hence, conclusion I follows. All diesels are oils (I)  ⇒ Conversion ⇒  Some oils are diesels (I). Hence, conclusion II does not follow.

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