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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 conclusion(s) logically follow(s) from the statements.
Statements:
All hens are drivers.
All fruits are drivers.
Conclusions:
(I) Some hens are fruits.
(II) Some drivers are fruits.

The correct answer is
Only conclusion (II) follows.

Understanding the Syllogism Statements

This problem involves logical reasoning, specifically analyzing syllogisms. We are given two statements and two conclusions. We need to determine which conclusion(s) must be true if the statements are true.

Statements provided:

  • Statement 1: All hens are drivers.
  • Statement 2: All fruits are drivers.

Let's represent these statements using sets:

  • Let H be the set of all hens.
  • Let D be the set of all drivers.
  • Let F be the set of all fruits.

Based on the statements:

  • Statement 1 means H is a subset of D (H ⊆ D). Every member of set H is also a member of set D.
  • Statement 2 means F is a subset of D (F ⊆ D). Every member of set F is also a member of set D.

Visually, we can imagine a large circle representing 'drivers'. Inside this large circle, there are two smaller circles, one for 'hens' and one for 'fruits'. Both smaller circles are completely within the 'drivers' circle.

Analyzing the Conclusions

Now let's evaluate each conclusion based on the information from the statements.

Conclusion (I): Some hens are fruits.

This conclusion claims that there is an overlap between the set of hens (H) and the set of fruits (F). In set notation, it means H ∩ F ≠ ∅.

From the statements, we know that both hens (H) and fruits (F) are separate groups within the larger group of drivers (D). The statements do not provide any information about whether the 'hens' group overlaps with the 'fruits' group. It's possible they are completely separate groups within the 'drivers' category. Therefore, this conclusion does not necessarily follow logically from the given statements.

Conclusion (II): Some drivers are fruits.

This conclusion claims that there are members of the set 'drivers' (D) who are also members of the set 'fruits' (F). In set notation, it means D ∩ F ≠ ∅.

We know from Statement 2 that "All fruits are drivers" (F ⊆ D). If every single fruit is also a driver, it logically follows that at least some drivers must be fruits. Specifically, all the members of the set F are drivers. Therefore, this conclusion logically follows from the statements.

Final Decision on Conclusions

Based on the analysis:

  • Conclusion (I) does not necessarily follow.
  • Conclusion (II) logically follows.

Thus, only conclusion (II) follows from the given statements.

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Important Questions from Syllogism (Notes)

  1. Take the given statements to be true even if they seem to be at variance with commonly known facts. Then decide which of the given conclusions logically follow the given statements. 

    Statements : 

    0% chairs are tables. 

    All computers are chairs. 

    Some books are tables. 

    Conclusions : 

    I. Not a single table is a computer. 

    II. Some books are not chairs.

  2. Directions: Study the following Bar-chart and the data provided to answer the questions that follow: Sales of 3-different companies selling T-Shirts for the years from 2006 to 2009 are given. How much percentage of sales decreased for Brand X T-shirt in 2009 compared with 2007?

  3. Statements: 

    All herbivores are carnivores.

     Some carnivores are omnivores. 

    Conclusions:

     i) Some herbivores are omnivores.

     ii) Some carnivores are herbivores.

  4. Statements: 

    All sweets are snacks. 

    All snacks are crisps. 

    All crisps are tasty. 

    Conclusions: 

    i) All sweets are crisps. 

    ii) All snacks are tasty.

  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 furs are rabbits.
    All furs are plants.
    Conclusions:
    (I): Some rabbits are plants.
    (II): All plants are furs.

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