Sigma Percentile
JEE Main 2019 (12 April Shift 1)
LEVELBoard

Animated Solution for Mathematics - Sets and Relations: If the truth value of the statement is false(F), then the truth values of the statements p, q, r are respectively :

Select Answer:

Visualized Solution

Analyzing the Given Statement

  • Given statement:
  • Overall truth value is given as False (F).
  • *Note: The original question has a typo ( instead of ). We correct it to match the 3-variable options.*

Rule of Implication ()

  • We need to find when an implication is False.
  • Rule: if and only if and .
  • The antecedent must be True, and the consequent must be False.

Applying the Implication Rule

  • Applying the rule to :
  • Antecedent:
  • Consequent:

Rule of Disjunction ()

  • Now we analyze the consequent: .
  • Rule: A disjunction (OR statement) is False if and only if both and .

Deducing and

  • Applying the OR rule to :
  • First component:
  • Second component:

Finding the Truth Value of

  • We have (Not is False).
  • The negation of a False statement is True.
  • Therefore, .

Final Conclusion

  • Collecting all deduced truth values:
  • The correct sequence for is T, T, F.

The Sigma Insight: Types of Sets and Set Operations

Solution Diagram

Analyzing the Logical Structure

Welcome, fellow traveler on the path to JEE mastery. Today, we are not just solving a problem; we are peeling back the layers of a logical structure. Logic is the bedrock of all mathematics, and understanding it is like learning the secret language of the universe.
Let us dive into the statement .

The Implication Trap

Imagine you are standing before a grand gate. The statement is a logical gate, and we are told it is False.
In the world of propositional logic, an implication is a promise. It says, "If is true, then must be true." The only way this promise is shattered—the only way the entire statement becomes False—is if the premise is True, but the conclusion is False.
In our specific case, is and is . Therefore, for the entire expression to be False, we must have:
This is our first major breakthrough. We have already determined the truth value of ! It must be True.

The Disjunction Rule

Now, let us turn our attention to the second part: . This is a disjunction, an "OR" statement.
Think of an OR statement as a team effort. For the team to fail (be False), every single member must fail. If even one member succeeds, the team succeeds.
Thus, for the disjunction to be False, both components must be False:
Look at the elegance of this! We have immediately found the value of . It is False. We are now left with the final piece of our puzzle: .

The Final Deduction

We are at the finish line. We have . This is the negation of .
If the negation of is False, then itself must be the opposite. It must be True. Let us collect our findings like precious gems:
When we put them together, we get the sequence . It is a beautiful, clean result.
You see, logic isn't about memorizing tables; it's about visualizing the flow of truth. You have successfully navigated the implication, dismantled the disjunction, and arrived at the truth.

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