New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    In each question below are given some statements followed by four conclusions numbered I, II, III and IV are given. You have to take the three 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. 

    Statements: Some doors are rods.

                                  Some rods are curtains.

                                All curtains are long.

                                All long are windows.

    Conclusion:   I. Some windows are rods.

                          II. Some windows are doors.

                          III. Some long are rods.

                           IV. Some windows are curtains.

    A Only I, II and III follow Correct Answer Incorrect Answer
    B Only I, III and IV follow. Correct Answer Incorrect Answer
    C Only II, III and IV follow. Correct Answer Incorrect Answer
    D All follow Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Some rods are curtains(I) + All curtains are long(A) ⇒ Some rods are long(I) + All long are windows(A) ⇒ Some rods are windows(I) ⇒ Conversion ⇒ Some windows are rods(I). Hence conclusion I follows. Some doors are rods(I) + Some rods are curtains(I) ⇒ No conclusion. Hence conclusion II does not follow. Some rods are curtains(I) + All curtains are long(A) ⇒ Some rods are long(I) ⇒ Conversion ⇒ Some long are rods(I). Hence conclusion III follows. All curtains are long(I) + All long are windows(A) ⇒ All curtains are windows(A) ⇒ Conversion ⇒ Some windows are curtains(I). Hence conclusion IV follows.

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