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Question

Consider the following sentences:
All benches are beds .No bed is a bulb. Some bulbs are lamps.
Which of the following can be inferred?
i. Some beds are lamps.
ii. Some lamps are beds.

The correct answer is
Neither i nor ii

Inference Analysis: Beds, Bulbs, and Lamps

We need to determine if the given conclusions can be logically inferred from the provided statements.

Statements Analysis

  • Statement 1: All benches are beds. (Representation: If something is a bench, it is a bed.)
  • Statement 2: No bed is a bulb. (Representation: The set of beds and the set of bulbs are completely separate.)
  • Statement 3: Some bulbs are lamps. (Representation: There is at least one bulb that is also a lamp.)

Conclusions Analysis

  • Conclusion i: Some beds are lamps.
  • Conclusion ii: Some lamps are beds.

Reasoning

Let's analyze the relationship between beds and lamps based on the statements:

  1. From statement 2, we know that the category 'beds' and 'bulbs' do not overlap at all.
  2. From statement 3, we know that there is an overlap between 'bulbs' and 'lamps'. This means the bulbs that are lamps cannot be beds (because no bulbs are beds).
  3. However, the statements do not provide any information about the relationship between lamps that are *not* bulbs and beds. It's possible they overlap, or they might not.
  4. Since there's no guaranteed link or overlap established between 'beds' and 'lamps' based on the given information, we cannot definitively infer that some beds are lamps (Conclusion i) or that some lamps are beds (Conclusion ii).

Therefore, neither conclusion i nor conclusion ii can be logically inferred.

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Important Questions from Syllogism

  1. Statements:
    1. All heroes are winners.
    2. All winners are lucky people.
    Inferences:
    I. All lucky people are heroes.
    II. Some lucky people are heroes.
    III. Some winners are heroes.
    Which of the above inferences can be logically deduced from statements 1 and 2? 

  2. Human beings are one among many creatures that inhabit an imagined world. In this imagined world, some creatures are cruel. If in this imagined world, it is given that the statement “Some human beings are not cruel creatures” is FALSE, then which of the following set of statement(s) can be logically inferred with certainty? 
    (i) All human beings are cruel creatures.
    (ii) Some human beings are cruel creatures.
    (iii) Some creatures that are cruel are human beings.
    (iv) No human beings are cruel creatures.

  3. Given below are four statements.
    Statement 1: All students are inquisitive.
    Statement 2: Some students are inquisitive.
    Statement 3: No student is inquisitive.
    Statement 4: Some students are not inquisitive.
    From the given four statements, find the two statements that CANNOT BE TRUE simultaneously, assuming that there is at least one student in the class.
  4. Based only on the truth of the statement ‘Some humans are intelligent', which one of the following options can be logically inferred with certainty?
  5. Given below are two statements and four conclusions drawn based on the statements.
    Statement 1: Some bottles are cups.
    Statement 2: All cups are knives.
    Conclusion I: Some bottles are knives.
    Conclusion II: Some knives are cups.
    Conclusion III: All cups are bottles.
    Conclusion IV: All knives are cups.
    Which one of the following options can be logically inferred? 

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