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Let p be the statement "It rains"! and q...

Let p be the statement "It rains"! and q be the statement "It is cold".
STATEMENT-1 : If it rains then it is cold, if it does not rain then it is not cold.
and
STATEMENT-2 : `p rArr q =~ pvvq`

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1

C

Statement-1 is False, Statement-2 is True

D

Statement-1 is True, Statement-2 is False

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the two statements given in the question and verify their truth values using logical reasoning and truth tables. ### Step-by-Step Solution: 1. **Define the Statements**: - Let \( p \) represent the statement "It rains". - Let \( q \) represent the statement "It is cold". 2. **Translate Statement-1 into Logical Form**: - Statement-1 says: "If it rains then it is cold, if it does not rain then it is not cold." - This can be expressed in logical form as: - \( p \rightarrow q \) (If it rains, then it is cold) - \( \neg p \rightarrow \neg q \) (If it does not rain, then it is not cold) 3. **Construct the Truth Table for Statement-1**: - We will create a truth table for \( p \) and \( q \) and evaluate \( p \rightarrow q \) and \( \neg p \rightarrow \neg q \). | \( p \) | \( q \) | \( p \rightarrow q \) | \( \neg p \) | \( \neg q \) | \( \neg p \rightarrow \neg q \) | |---------|---------|-----------------------|--------------|--------------|---------------------------------| | T | T | T | F | F | T | | T | F | F | F | T | T | | F | T | T | T | F | F | | F | F | T | T | T | T | - From the truth table, we can see that: - \( p \rightarrow q \) is true in 3 out of 4 cases. - \( \neg p \rightarrow \neg q \) is true in 3 out of 4 cases. 4. **Evaluate Statement-1**: - Statement-1 is true if both \( p \rightarrow q \) and \( \neg p \rightarrow \neg q \) are true. - Since \( p \rightarrow q \) is false when \( p \) is true and \( q \) is false, and \( \neg p \rightarrow \neg q \) is false when \( p \) is false and \( q \) is true, we conclude that Statement-1 is not universally true. 5. **Translate Statement-2 into Logical Form**: - Statement-2 states: \( p \rightarrow q \equiv \neg p \vee q \). - This means "If it rains, then it is cold" is logically equivalent to "Either it does not rain or it is cold". 6. **Construct the Truth Table for Statement-2**: - We will create a truth table for \( \neg p \vee q \). | \( p \) | \( q \) | \( \neg p \) | \( \neg p \vee q \) | |---------|---------|--------------|----------------------| | T | T | F | T | | T | F | F | F | | F | T | T | T | | F | F | T | T | 7. **Evaluate Statement-2**: - From the truth table, we see that \( p \rightarrow q \) and \( \neg p \vee q \) yield the same truth values: - Both are true in 3 out of 4 cases and false in 1 case. - Therefore, Statement-2 is true. 8. **Conclusion**: - Statement-1 is false. - Statement-2 is true. ### Final Answer: - **Statement-1**: False - **Statement-2**: True
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Knowledge Check

  • The negation of the statement It is raining and weather is cold is

    A
    It is not raining and weather is cold.
    B
    It is raining or weather is not cold.
    C
    It is not raining or weather is not cold .
    D
    It is not raining and weather is not cold .
  • For any statements p and q , the statement ~(~p^^q) is equivalent to

    A
    `pvv~q`
    B
    `p^^~q`
    C
    `~p^^q`
    D
    `~pvvq`
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