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Question

If there is rainfall in a village, flowers will bloom. If flowers bloom, celebrations will definitely take place. Flowers did not bloom. Which of the following is certain?

The correct answer is
It did not rain

Understanding the Logic Problem

This question tests our ability to understand and apply logical implications, also known as conditional statements. We are given a set of conditions and a specific fact, and we need to determine what conclusion logically follows with certainty.

Analyzing the Premises

Let's break down the statements given in the problem:

  • Premise 1: If there is rainfall in a village, flowers will bloom.
    • This can be represented in logic as: Rainfall $\implies$ Flowers Bloom.
    • Let 'R' represent "Rainfall occurs" and 'F' represent "Flowers bloom". The statement is $R \implies F$.
  • Premise 2: If flowers bloom, celebrations will definitely take place.
    • This can be represented as: Flowers Bloom $\implies$ Celebrations take place.
    • Let 'C' represent "Celebrations take place". The statement is $F \implies C$.

Applying the Given Fact

The question states: Flowers did not bloom.

  • In logical terms, this means $\neg F$ (Not F) is true.

Step-by-Step Deduction

We need to see what conclusion is certain based on $R \implies F$, $F \implies C$, and the fact $\neg F$.

  1. Consider Premise 1: $R \implies F$. The contrapositive of this statement is also true. The contrapositive is $\neg F \implies \neg R$. This means "If flowers did not bloom, then it did not rain".
  2. Apply the Fact: We know that flowers did not bloom ($\neg F$).
  3. Draw Conclusion: Using the contrapositive ($\neg F \implies \neg R$) and the fact ($\neg F$), we can definitively conclude that it did not rain ($\neg R$).
  4. Consider Premise 2: $F \implies C$. We know $\neg F$. When the first part (antecedent) of an implication is false, the implication itself is true, but it doesn't tell us whether the second part (consequent) is true or false. So, knowing flowers did not bloom ($\neg F$) doesn't allow us to conclude anything certain about whether celebrations took place ($C$) or not ($\neg C$). Celebrations might still happen for other reasons, or they might not.

Evaluating the Options

  • Option 1: Celebrations took place (C): Not certain. We only know $\neg F$.
  • Option 2: Celebrations did not take place ($\neg C$): Not certain. We only know $\neg F$.
  • Option 3: It did not rain ($\neg R$): This is certain, as deduced from the contrapositive of Premise 1 ($\neg F \implies \neg R$) and the given fact ($\neg F$).
  • Option 4: It rained too much: This implies $R$. Since we concluded $\neg R$, this statement is certainly false. The question asks what is certain (implying true).

Final Conclusion

Based on the logical deduction using the given premises and the fact that flowers did not bloom, the only conclusion that is certain is that it did not rain.

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Important Questions from Statement and Conclusion (Notes)

  1. In this question, a statement is given 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:
    Ameen divides all his property among his four children.

    Conclusions:
    i) Ameen has only four children.
    ii) Ameen will not take any share from his property.

    Choose the appropriate one from the following options
    (A) Only conclusion i follows
    (B) Only conclusion ii follows
    (C) Either i or ii follows
    (D) Neither i nor ii follows
    (E) Both i and ii follow.

  2. In the given question, a statement is given followed by some conclusions. Choose the conclusion(s) which logically follow(s) the given statement. 

    Statement: 

    Few shops on this road have neon lights, but they all have signboards. 

    Conclusions : 

    I. Some shops have either signboards or neon lights. 

    II. Some shops have no signboards. 

    III. Some shops have no neon lights. 

    IV. Some shops have both signboards and neon lights. 

    The conclusion(s) correctly drawn is/are :

  3. In this question, a statement is given 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:
    Rohan will announce his retirement after 2020 Olympics.
    Conclusions:
    i) Rohan is a sportsperson.
    ii) Rohan is not a sportsperson.

    Choose the appropriate one from the following options

    (A) Only conclusion i follows. 

    (B) Only conclusion ii follows. 

    (C) Both conclusion i and ii follow. 

    (D) Neither  i nor ii follows.

    (E) Both i and ii follow.

  4. Statements: Morning walks are good for health.
    Conclusions: I: All healthy people go for morning walks.
    II: Evening walks are harmful.
    Choose the correct option :
  5. Consider the following four statements. 

    Statement 1: "Statement 3 is true." 

    Statement 2: "Statement 1 is true" 

    Statement 3: "Statement 1 is true and Statement 2 is false" 

    Statement 4: "Statements 1, 2 and 3 are false" 

    Which of the above statements must be true for the four statements to be mutually consistent?

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