Three statements are given followed by three conclusions I, II, and III. Assuming that the information given in the statements is true, even if it seems to be at variance from commonly known facts, decide which of the given conclusions logically follows from the statements.
Statement:
All cows are mammals.
All donkeys are mammals.
All mammals are animals.
Conclusion:
I. All donkeys are animals.
II. All animals are donkeys.
III. Some cows are donkeys.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Only conclusion I follows
The least possible Venn Diagram for the given statements is drawn below:
Conclusions:
I. All donkeys are animals → True (As all donkeys are mammals, and all mammals are animals, so, all donkeys are animals is also true.)
II. All animals are donkeys → False (It is possible but no definite conclusion can be drawn.)
III. Some cows are donkeys → False (It is possible but no definite conclusion can be drawn.)
Hence, Only conclusion I follows.