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Question

All birds can fly. Some birds cannot fly. Which of the following conclusions is correct?

This question was previously asked in
SSC Stenographer 2025 Question Paper (06-Aug-2025) Shift 2
The correct answer is
Some birds cannot fly

Analyzing the Bird Flight Premises

This question presents two statements about the flying capabilities of birds:

  • Premise 1: All birds can fly. This is a universal statement implying every single bird has the ability to fly.
  • Premise 2: Some birds cannot fly. This is a particular statement indicating that there exists at least one bird that lacks the ability to fly.

It's important to recognize that these two premises are contradictory. If it's true that some birds cannot fly (Premise 2), then the statement that all birds can fly (Premise 1) must be false.

Evaluating the Potential Conclusions

We need to determine which of the given options logically follows from the premises, keeping in mind the contradiction.

  • Option 1: All birds can swim. The provided statements only talk about birds and their ability to fly. There's no information given about swimming. Thus, we cannot logically conclude that all birds can swim based solely on the premises.
  • Option 2: Some birds are fish. The premises discuss birds and flight. They do not provide any information connecting birds to fish. This conclusion is irrelevant to the given statements.
  • Option 3: Some birds cannot fly. This option is exactly the same as Premise 2. Since Premise 2 is given as a statement, and it directly addresses the characteristic of birds not being able to fly, this is the most direct and correct conclusion that can be drawn. If Premise 2 is accepted as true, then this conclusion must also be true.
  • Option 4: All birds are animals. While this is a generally accepted fact, it cannot be logically derived *only* from the two premises about birds flying. The premises do not provide any information about the classification of birds within a larger group like animals.

Deriving the Correct Conclusion

The question presents two conflicting statements. However, it asks for a correct conclusion among the options.

Statement 2, "Some birds cannot fly," is presented as a premise. Option 3 is a direct restatement of this premise. In logical reasoning questions like this, especially when premises conflict, the option that mirrors a given premise is often the intended answer, as it represents a specific assertion being made.

Therefore, based on the provided statements, the conclusion Some birds cannot fly is correct because it is explicitly stated as Premise 2.

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Important Questions from Statement and Conclusions

  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 conclusion(s) logically follow(s) from the statements. 
    Statements: 
    All cats are bills. 
    No snakes are bills. 
    All snakes are dolls. 
    Conclusions: 
    (I) Some dolls are not cats. 
    (II) No bills are dolls.

  2. Select the conclusion, from among the following options, which logically follows from the given statement.

    Statement:

    One must work hard to be successful in life.
  3. Read the given statement 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.

    Statement:
    Doing exercises in the morning is good for health.

    Conclusion 1:
    Health can be maintained by doing exercises only.

    Conclusion 2:
    Without doing exercises, people will become ill.
  4. Read the given statements and conclusions carefully and select the conclusion(s) that logically follow(s) from the statements.

    Statements:
    Indian Education is lacking quality due to low funds. India is allocating additional funds to education sector.

    Conclusions:
    I. There would be improvement in quality of education in India.
    II. Only funds can improve the education standards.
  5. In the question below is given a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true, then consider the two conclusions together and decide which of them logically follows beyond a reasonable doubt from the information given in the statement.

    Statement:
    If A was there in XYZ cricket team, XYZ would have been the invincible team in the world.

    Conclusion:
    I. Without A, XYZ cannot win.
    II. A is more talented than anyone else in the XYZ cricket team
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