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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 follows from the statements.

Statements:

Some bowls are cups.

All cups are glasses.

Some glasses are plates.

All plates are utensils.

Conclusions:

I. All bowls cannot be utensils.

II. All glasses cannot be utensils

The correct answer is

Neither conclusion I nor II follows

Analyzing Statements and Conclusions on Bowls, Cups, Glasses, Plates, and Utensils

The problem requires us to evaluate two conclusions based on a set of given statements. We must assume the statements are true and determine which conclusions logically follow from them.

Understanding the Statements

Let's break down the given statements:

  1. Some bowls are cups. (This indicates an overlap between the set of bowls and the set of cups.)
  2. All cups are glasses. (This means the entire set of cups is contained within the set of glasses.)
  3. Some glasses are plates. (This indicates an overlap between the set of glasses and the set of plates.)
  4. All plates are utensils. (This means the entire set of plates is contained within the set of utensils.)

Evaluating Conclusion I: All bowls cannot be utensils.

This conclusion claims it's impossible for all bowls to be utensils. Let's see if we can construct a scenario (a possible Venn diagram representation) where all bowls are utensils, without contradicting any of the statements.

  • From statement 1 & 2: Some bowls are cups, and all cups are glasses. This implies that some bowls are glasses.
  • From statement 3 & 4: Some glasses are plates, and all plates are utensils. This implies that some glasses are utensils.

Now consider if all bowls can be utensils. The statements only guarantee that some bowls are glasses (because they are cups). What about the other bowls (if any)? Or even the bowls that are glasses? The statements do not restrict bowls from being plates or utensils directly. It is possible to draw a diagram where:

  • Some bowls are cups (and thus glasses).
  • The part of bowls that are glasses overlaps with plates (which are utensils).
  • The remaining bowls (those not cups) are also within the set of utensils (perhaps overlapping with plates or just being utensils directly).

For instance, imagine if the set of 'bowls' was entirely contained within the set of 'utensils'. This would not contradict any statement: 'Some bowls are cups' could still be true (that specific 'some' portion of bowls is also cups and thus utensils), 'All cups are glasses' would be true, 'Some glasses are plates' would be true, and 'All plates are utensils' would be true. Since it is possible for all bowls to be utensils, the conclusion "All bowls cannot be utensils" does not logically follow.

Evaluating Conclusion II: All glasses cannot be utensils.

This conclusion claims it's impossible for all glasses to be utensils. Let's see if we can construct a scenario where all glasses are utensils, without contradicting any of the statements.

  • From statement 3 & 4: Some glasses are plates, and all plates are utensils. This directly implies that some glasses are utensils.

Can all glasses be utensils? The statements only guarantee that some glasses are utensils (specifically, the ones that are plates). What about the rest of the glasses? The statements do not restrict glasses from being utensils. It is possible to draw a diagram where:

  • The entire set of glasses is contained within the set of utensils.
  • The 'some glasses' that are plates (and thus utensils) exist within this larger set of glasses.

Since statement 3 says "Some glasses are plates" and statement 4 says "All plates are utensils", we know that the set of plates is a subset of glasses AND a subset of utensils. This guarantees an overlap between glasses and utensils. However, this does not preclude the possibility that the entire set of glasses is also a subset of utensils. Since it is possible for all glasses to be utensils, the conclusion "All glasses cannot be utensils" does not logically follow.

Conclusion Summary

Based on our analysis:

  • Conclusion I ("All bowls cannot be utensils") does not follow because it is possible for all bowls to be utensils.
  • Conclusion II ("All glasses cannot be utensils") does not follow because it is possible for all glasses to be utensils.

Therefore, neither conclusion logically follows from the given statements.

Statement Relationship
Some bowls are cups. Bowls ∩ Cups ≠ ∅
All cups are glasses. Cups ⊂ Glasses
Some glasses are plates. Glasses ∩ Plates ≠ ∅
All plates are utensils. Plates ⊂ Utensils

Result

Neither conclusion I nor conclusion II follows from the given statements.

Revision Table: Syllogism Basics

Term Explanation
Statement (Premise) A proposition assumed to be true for the purpose of an argument.
Conclusion A proposition that is claimed to follow logically from the statements.
Syllogism A form of deductive reasoning where a conclusion is drawn from two or more given premises.
Follows Logically Means the conclusion must be true if the statements are true, in all possible scenarios consistent with the statements.
Does Not Follow Means there is at least one possible scenario consistent with the statements where the conclusion is false.

Additional Information: Types of Statements in Syllogism

Statements in syllogism problems typically fall into one of four categories:

  • Universal Affirmative (A): All S are P. (e.g., All cups are glasses)
  • Universal Negative (E): No S are P. (e.g., No cups are plates)
  • Particular Affirmative (I): Some S are P. (e.g., Some bowls are cups)
  • Particular Negative (O): Some S are not P. (e.g., Some glasses are not plates)

Understanding these types helps in visually representing the relationships using Venn diagrams or analyzing them using rules of logic. "Cannot be" in a conclusion often implies a particular negative statement, or checking for the possibility of the opposite (a universal affirmative or particular affirmative).

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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:

    All dancers are talented.

    Some girls are dancers.

    Conclusions:

    I. Some girls are talented.

    II. All talented are girls.

    III. All girls are talented.

  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:

    All directors are actors.

    No actor is a producer.

    All choreographers are directors.

    Conclusions:

    I. No choreographer is producer.

    II. Some actors are choreographers.

    III. No director is a producer.

  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 follows from the statements.

    Statements:

    All lemons are plums.

    All plums are dates.

    Some dates are mangoes.

    Conclusions:

    I. Some lemons are mangoes.

    II. Some mangoes are plums.

    III. All lemons are dates.

    IV. Some mangoes are dates.

  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:

    Some cards are postcards.

    Some cards are envelopes.

    All envelopes are copies.

    Conclusions:

    I. Some copies are envelopes.

    II. Some postcards are copies.

    III. Some cards are copies.

  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 employees are tax-payers.

    Some employees are farmers.

    Some farmers are doctors.

    Conclusions:

    I. No farmer is a tax-payer.

    II. Some farmers are tax-payers.

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