Question

    In the question below some statements are given

    followed by four conclusions I, II, III and IV. 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 statements and then decide which of the given conclusion definitely follows from the given statements, disregarding the commonly known facts. Statements: Some A is N. All A is U. No U is B. All B is T. Conclusions: I. Some T being A is a possibility. II. No B is N. III. Some N is not T. IV. Some T is not U.
    A Only conclusion I follows Correct Answer Incorrect Answer
    B Only conclusions I and IV follow Correct Answer Incorrect Answer
    C Only conclusions I, II and IV follow Correct Answer Incorrect Answer
    D Only conclusion IV follows Correct Answer Incorrect Answer

    Solution

    All A is U (A) + No U is B (E) → No A is B (E) + All B is T (A) → Some T is not A (O*) → Probable conclusion → Some T may be A (I). Hence conclusion I follows bot conclusion III does not follow. All A is U (A) + No U is B (E) → No A is B (E) → Conversion → No B is A (E) + Some A is N (I) → Some N is not B (O*). Hence conclusion II does not follow. No U is B (E) + All B is T (A) → Some T is not U (O*). Hence conclusion IV follows.

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