Question

    Statement:  All petrol are diesel. Only a

    few petrol are coal. Some diesel are kerosene.   Conclusion: All coal being kerosene is a possibility.   All coal are diesel is a possibility. All diesel can be petrol.   In each of the question below are given some statements followed by some conclusions. You have to take the given statements to be true even if they seem to be at variance with 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. 
    A Only I follow Correct Answer Incorrect Answer
    B None follows Correct Answer Incorrect Answer
    C Only I and III follows Correct Answer Incorrect Answer
    D Only IV follows Correct Answer Incorrect Answer
    E All follow Correct Answer Incorrect Answer

    Solution

    Some petrol are coal (I) → Conversion → Some coal are petrol (I) + All petrol are diesel (A) → Some coal are diesel (I) + Some diesel are kerosene (I) → Probable conclusion → All coal can be kerosene (I). Hence conclusion I follows. Some petrol are coal (I) → Conversion → Some coal are petrol (I) + All petrol are diesel (A) → Some coal are diesel (I) → Probable conclusion → All coal can be diesel (I). Hence conclusion II follows. All petrol are diesel (A) → Probable conclusion → All diesel can be petrol (I). Hence conclusion III follows. Alternate Method -

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