Sigma Percentile
JEE Main 2022 (25 June Shift 1)
LEVELBoard

Animated Solution for Mathematics - Sets and Relations: Consider the following two propositions: \\ \\ \\ If the proposition is evaluated as FALSE, then:

Select Answer:

Visualized Solution

The Given Condition

  • Given Condition:
  • is FALSE

The Rule of Implication

  • Rule of Implication:
  • is FALSE iff and
  • Therefore,
  • And

Breaking Down the RHS

  • Since , its negation
  • We have
  • For an OR () operation to be FALSE, both operands must be FALSE
  • Thus,

Evaluating Proposition P1

  • Evaluating Proposition P1:

Substituting Values in P1

  • Substitute and

Final Result for P1

  • evaluates to TRUE

Evaluating Proposition P2

  • Evaluating Proposition P2:

Substituting Values in P2

  • Substitute and
  • First part:
  • Second part:

Final Result for P2

Conclusion

  • Final Conclusion:
  • Both and evaluate to FALSE
  • Correct Option: Both and are FALSE

The Sigma Insight: Types of Sets and Set Operations

Solution Diagram

Analyzing the Setup

Welcome, future engineer! Today, we are going to step into the shoes of a logic detective. We have a mystery: a complex logical proposition that evaluates to FALSE, and we need to uncover the hidden truth values of our variables, and .
This isn't just about solving a problem; it's about understanding the fundamental architecture of reasoning.

The Crime Scene

The False Implication
We are given the condition that is FALSE. In the world of logic, an implication is a very specific structure.
It is only FALSE in one unique, catastrophic scenario: when the premise is TRUE, and the conclusion is FALSE. If the premise were FALSE, the implication would be vacuously TRUE.
So, we immediately know two things: 1. must be TRUE. 2. The entire expression must be FALSE.

The Deduction

Now, let's look at our second piece of evidence: . We already deduced that is TRUE, which means its negation, , is FALSE.
Now we have an OR statement: . For an OR operation to be FALSE, both components must be FALSE.
Since is already FALSE, the only way for this statement to be FALSE is if is also FALSE. We have cracked the case: is TRUE and is FALSE.

Evaluating the Propositions

Now that we have our suspects, and , let's test our propositions.
First, consider . Substituting our values, we get .
So, becomes . Since is TRUE, the negation makes FALSE.
Finally, let's look at . Substituting our values: becomes , which is TRUE.
The second part, , becomes , which is FALSE. So, is .
As any good detective knows, an AND operation requires both sides to be TRUE to succeed. Since one side is FALSE, is also FALSE.

The Conclusion

We have systematically dismantled the problem. Both and evaluate to FALSE.
Logic isn't just about symbols; it's about the clarity of thought. Keep practicing, and you'll find that even the most complex logical structures become simple, elegant puzzles.

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