Question : Directions: In the following question, two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if they are seen to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.
Statements:
1. All dawns are day.
2. No day is night.
Conclusions:
I. No night is day.
II. Some dawns are night.
Option 1: Only conclusion I follows
Option 2: Only conclusion II follows
Option 3: Both I and II follow
Option 4: Neither I nor 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):
No night is day – From the diagram, we can see that circles representing night and day have a negative relation between them. So, this conclusion follows.
Conclusion (II):
Some dawns are night – From the diagram, we can see that circles representing night and day have a negative relation between them and dawn is the part of day, which implies that no dawn is night. So, this conclusion does not follow.
So, the only conclusion I follows. Hence, the first option is correct.
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