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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 doors are carpets.
No carpet is a mat.

Conclusions:
(I) No door is a mat.
(II) No mat is a carpet.

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
Both conclusions (I) and (II) follow.

This question tests the ability to draw logical conclusions from given statements using principles of syllogism.

Analyzing the Statements

Let D represent Doors, C represent Carpets, and M represent Mats.

  • Statement 1: All doors are carpets. This can be represented as: $D \subseteq C$. (The set of Doors is a subset of the set of Carpets).
  • Statement 2: No carpet is a mat. This means the sets C and M are disjoint: $C \cap M = \emptyset$.

Evaluating Conclusion (I)

Conclusion (I): No door is a mat. ($D \cap M = \emptyset$)

  • From Statement 1, we know all doors (D) belong to the set of carpets (C).
  • From Statement 2, we know that nothing in the set of carpets (C) belongs to the set of mats (M).
  • Since all doors are within the carpet set, and the carpet set is entirely separate from the mat set, it logically follows that no door can be a mat.
  • Thus, Conclusion (I) logically follows.

Evaluating Conclusion (II)

Conclusion (II): No mat is a carpet. ($M \cap C = \emptyset$)

  • Statement 2 directly states "No carpet is a mat" ($C \cap M = \emptyset$).
  • The relationship "No X is Y" is symmetric, meaning it implies "No Y is X".
  • Therefore, "No mat is a carpet" ($M \cap C = \emptyset$) is logically equivalent to "No carpet is a mat".
  • Thus, Conclusion (II) logically follows.

Final Deduction

Since both Conclusion (I) and Conclusion (II) logically follow from the given statements, the correct option is the one stating that both conclusions are valid.

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Similar Questions

  1. Read the given statement(s) 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 conclusion(s) logically follow(s) from the statement(s).

    Statements:
    All Hummingbirds are Storks.
    Some Storks are Flamingos.

    Conclusions:
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    II. No Flamingos are Hummingbirds.
  2. 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.

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  6. Two statements are given below. Decide which of the options logically follow from these statements.

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Important Questions from Syllogism

  1. 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:

    Some students are players.

    All players are male.

    Conclusions:

    I. All males are players.

    II. Some males are students.

  2. 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:

    No creative is an employer.

    All experts are creative.

    All workers are experts.

    Conclusions:

    I. No employer is an expert.

    II. No worker is an employer.

  3. 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:

    Some actors are choreographers.

    All choreographers are producers.

    Not a single producer is a director.

    Conclusions:

    I. Some actors are directors.

    II. Not a single actor is a director.

  4. 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 : 

    1. All flowers are tulips.

    2. No tulips are whites.

    Conclusions :

    I. All tulips are flowers.

    II. Some tulips are whites.

  5. 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 rats are dogs.

    Some rats are hens.

    Conclusions:

    I. Some rats are dogs.

    II. Some hens are rats.

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