Sigma Percentile
JEE Main 2021 (27 Aug Shift 2)
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Animated Solution for Mathematics - Sets and Relations: The Boolean expression is equivalent to:

Select Answer:

Visualized Solution

Introduction to the Problem

  • Given Expression:

The Implication Rule

  • Using the property:
  • Applying to our expression:

Rearranging the RHS

  • Rearranging terms using Associative Law:

Substitution for Clarity

  • Substitution: Let
  • The expression becomes:

Applying Distributive Law

  • Using Distributive Law:

Simplifying with Tautology

  • Since Tautology:

Returning to Original Variables

  • Substituting back:
  • Converting back to implication form:

Analyzing Option One

  • Option 1:
  • Simplify:

Final Simplification of Option One

Conclusion

  • Conclusion:
  • Original expression simplifies to .
  • Option 1 also simplifies to .
  • Correct Option: (1)

The Sigma Insight: Types of Sets and Set Operations

Analyzing the Setup

The expression may appear as a chaotic jumble of symbols, but it is a puzzle waiting to be decoded. By stripping away the complexity, we can reveal the hidden simplicity beneath.

Phase 1

The Implication Trap
The first hurdle is the implication operator, . We must transform it using the fundamental identity:
Applying this to our expression, where and , we obtain:
The arrow is now replaced by the familiar operators of NOT, AND, and OR. We have taken the first step toward clarity.

Phase 2

The Art of Rearrangement
Consider the second part of our expression: . Because the operator is exclusively AND, we are governed by the Associative and Commutative laws.
We can shuffle these variables to find patterns. By grouping and together, we rewrite the expression as:
This rearrangement is the "Aha!" moment. We have successfully created a common structure.

Phase 3

The Power of Substitution
To reduce cognitive load, let us use a substitution. Let .
The expression now transforms into:
It is no longer a terrifying string of symbols; it is a simple, elegant logical statement. We have moved from the forest of complexity into the clearing of simplicity.

Phase 4

The Distributive Dance
Next, we apply the Distributive Law. Distributing over the bracket yields:
We have expanded the logic, creating two distinct branches connected by an AND operator.

Phase 5

The Tautology Reveal
Look closely at the second bracket: . This is a Tautology.
Since a statement is either true or false, OR NOT must always be true, represented by . Our expression becomes:
Because anything AND True is simply the thing itself, the vanishes, leaving us with:

Phase 6

The Final Synthesis
Now, we reverse our substitution by replacing with :
Applying the implication rule in reverse, we rewrite this as:
We have successfully distilled the complexity into a concise, elegant implication. By testing the options, we find that the expression simplifies to the equivalent of .

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