Question : Directions: In the following question, two statements are given followed by two conclusions I and II. You have to consider the two statements to be true even if they seem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follow from the given statements.
Statements:
No man is a donkey.
Rahul is a man.
Conclusions:
I. Rahul is not a donkey.
II. All men are not Rahul.
Option 1: Either conclusion I or conclusion II follows
Option 2: Neither conclusion I nor II follows
Option 3: Only conclusion I follows
Option 4: Only conclusion II follows
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Correct Answer: Only conclusion I follows
Solution : The possible Venn diagram according to the given statements is as follows –
Let's analyse the conclusions –
Conclusion (I):
Rahul is not a donkey – From the Venn diagram, we can see that no man is a donkey and the circle of Rahul is completely inside the circle of man. Therefore, Rahul is not a donkey is a true conclusion.
Conclusion (II):
All men are not Rahul – From the Venn diagram, we can see that there is no negative relation between the men and Rahul. Therefore, this conclusion does not follow.
So, the only conclusion I follows. Hence, the third option is correct.
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