Statement: He is older than his brother. Conclusions: I. His brother is younger than him. II. They are not twins. MCQ with Answer and Explanation

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Statement: He is older than his brother. Conclusions: I. His brother is younger than him. II. They are not twins.

A. Only II follows

B. Only I follows

C. Both I and II follow

D. Neither I nor II follows

Answer: Option C

Solution (By JKSSB Mock Tests)

I is a restatement. II: if one is older, they can't be twins (identical age). Both follow.

This question belongs to: Reasoning Statement and Conclusion

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Question #1

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Statements:
1. All A are B.
2. Some A are C.
Conclusions:
I. Some B are C.
II. Some C are A.
Which conclusion(s) logically follow?

A. Neither I nor II follows

B. Both I and II follow

C. Only conclusion I follows

D. Only conclusion II follows

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Correct Answer: Option B

Explanation:
Since some A are C, and all A are inside B, the intersection of A and C must also be inside B, meaning some B are C (I). 'Some A are C' directly implies its reverse 'Some C are A' (II). Both follow.

This question belongs to: Reasoning Statement and Conclusion

Question #2

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Statement: All employees are punctual. Conclusions: I. Ramesh is punctual. II. Ramesh is an employee.

A. Both I and II follow

B. Neither I nor II follows

C. Only I follows

D. Only II follows

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Correct Answer: Option B

Explanation:
We don't know if Ramesh is an employee, so neither follows from the given statement alone.

This question belongs to: Reasoning Statement and Conclusion

Question #3

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Statement: All birds have wings. Conclusions: I. Penguins are birds, so they have wings. II. Bats have wings, so they are birds.

A. Neither I nor II follows

B. Only II follows

C. Both I and II follow

D. Only I follows

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Correct Answer: Option D

Explanation:
I follows from the general rule 'all birds have wings' applied to penguins. II is a fallacy; having wings doesn't make a bat a bird. Only I follows.

This question belongs to: Reasoning Statement and Conclusion

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