Sigma Percentile
JEE Main 2020 (9 January Shift 2)
LEVELBoard

Animated Solution for Mathematics - Basic Mathematics: If is false. Then the truth values of and are respectively

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Visualized Solution

The Given Logical Statement

  • Given statement: is False.
  • We need to find the truth values of and .

The Rule of Implication

  • The main operator is the implication ().
  • Recall the truth table for .
  • An implication is False if and only if is True and is False.

Splitting the Statement

  • Comparing with .
  • The premise corresponds to .
  • The conclusion corresponds to .

Determining the Truth Value of

  • From the implication rule, the premise must be True.
  • Therefore, we directly get .

Analyzing the Consequent

  • From the implication rule, the conclusion must be False.
  • Therefore, .

Substitution into the Consequent

  • We already know that .
  • Substitute this value into our equation: .

Applying the AND Rule

  • Recall the Conjunction (AND) rule: .
  • For to be False, the second term must be False.
  • Therefore, .

Finding the Truth Value of

  • We have found that .
  • By the definition of Negation, if is False, then must be True.
  • So, .

Final Conclusion

  • The truth value of is True ().
  • The truth value of is True ().
  • The correct option is T, T.

The Sigma Insight: Linear Inequalities

Solution Diagram

Analyzing the Setup

In the realm of mathematical logic, we are given the statement:
This is a structural failure in a logical argument. To solve this, we must work backward from the False result to determine the truth values of and .

The Anatomy of an Implication

The heart of this problem lies in the implication operator . An implication is only False if the antecedent is True and the consequent is False.
By mapping our statement to the form , we identify:
Since the entire statement is False, we are locked into the only possible scenario: must be True, and must be False. We have now determined with absolute certainty that .

The Conjunction Challenge

Next, we address the consequent:
We substitute our known value into this expression:
The conjunction (AND) operator is a strict gatekeeper; it only outputs True if both inputs are True. Since the output is False and the first input is True, the second input—the term —must be False.

The Final Reveal

We are left with the final piece of the puzzle:
The negation operator is an inverter. If the negation of is False, then itself must be the opposite. Therefore, .
Through the rigorous application of logical rules, we have determined that both and are True. The final result is .

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