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CAT 1991 Question Paper Question 120
Question 120

Select the set in which the statements are logically related.
A. All leaves are green.
B. All leaves have chlorophyll.
C. Chlorophyll is green.
D. All plants have leaves.
E. All plants have chlorophyll.
F. Only leaves have chlorophyll.

Solution

BDE will give the following Venn diagram which will give E as the conclusion for the premise BD.

From statements B and D we can infer E.

BEF is contradictory pair.

F is a false assumption in the pair BDF.



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