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Question

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:
All fathers are brothers.
All brothers are sons.

Conclusions:
(I) All fathers are sons.
(II) All brothers are fathers.

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
Only conclusion I follows.

Logical Analysis of Statements

This problem involves deductive reasoning based on given statements to determine the validity of conclusions.

Statements Analysis

  • Statement 1: All fathers are brothers.
  • Statement 2: All brothers are sons.

Conclusion Evaluation

  • Conclusion (I): All fathers are sons.

    We can represent the relationships using sets:

    • Let F = set of Fathers
    • Let B = set of Brothers
    • Let S = set of Sons

    Statement 1 implies: $F \subseteq B$ (All elements in F are also in B).

    Statement 2 implies: $B \subseteq S$ (All elements in B are also in S).

    Using the transitive property ($F \subseteq B$ and $B \subseteq S$ implies $F \subseteq S$), we conclude that all fathers are indeed sons.

    Therefore, Conclusion (I) logically follows.

  • Conclusion (II): All brothers are fathers.

    This conclusion implies: $B \subseteq F$.

    The given statements only state $F \subseteq B$. The reverse relationship ($B \subseteq F$) is not provided or implied. It is possible to have brothers who are not fathers.

    Therefore, Conclusion (II) does not logically follow.

Result

Only Conclusion (I) logically follows from the given statements.

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Similar Questions

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Important Questions from Syllogism

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    I. Some rats are dogs.

    II. Some hens are rats.

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