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Question

Three conclusions after the three statements below ।, ।। and ।।। have been given. Assuming the given statements to be true even if they appear to be different from the known facts, determine which conclusion follows the statements rationally. 
Statement: 
All apples are bananas. 
All grapes are bananas. 
All bananas are plums. 
The conclusion: 
|. All apples are plums. 
||. All grapes are plums. 
III. Some grapes are bananas.

The correct answer is
All the conclusions follow

Syllogism Logic: Analyzing Statements and Conclusions

This problem requires us to analyze a set of logical statements and determine which of the given conclusions can be rationally derived from them. We must assume the statements are true, even if they seem unusual.

Analyzing the Statements

Let's break down the given statements and represent them using logical notation:

  • Statement I: All apples are bananas. (Let A = Apples, B = Bananas)
    Notation: A \rightarrow B
  • Statement II: All grapes are bananas. (Let G = Grapes)
    Notation: G \rightarrow B
  • Statement III: All bananas are plums. (Let P = Plums)
    Notation: B \rightarrow P

Evaluating the Conclusions

Now, let's examine each conclusion based on the statements:

Conclusion I: All apples are plums.

We have:

  • A \rightarrow B (from Statement I)
  • B \rightarrow P (from Statement III)

Using the transitive property of logic (if A implies B, and B implies P, then A implies P), we can conclude that all apples are indeed plums.

Result: Conclusion I follows.

Conclusion II: All grapes are plums.

We have:

  • G \rightarrow B (from Statement II)
  • B \rightarrow P (from Statement III)

Again, using the transitive property, if all grapes are bananas (G \rightarrow B), and all bananas are plums (B \rightarrow P), then it logically follows that all grapes are plums.

Result: Conclusion II follows.

Conclusion III: Some grapes are bananas.

Statement II states: All grapes are bananas (G \rightarrow B).

In logic, if a statement applies to *all* members of a category (All G are B), it inherently implies that the statement also applies to *some* members of that category (Some G are B), provided the category is not empty. Assuming grapes exist, this conclusion is valid.

Result: Conclusion III follows.

Final Determination

Based on the logical analysis:

  • Conclusion I (All apples are plums) follows.
  • Conclusion II (All grapes are plums) follows.
  • Conclusion III (Some grapes are bananas) follows.

Therefore, all three conclusions rationally follow from the given 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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