Sigma Percentile
JEE Main 2020 - 3 Sep (Morning)
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Animated Solution for Mathematics - Sets and Relations: The proposition is equivalent to:

Select Answer:

Visualized Solution

Problem Analysis

  • Given expression:
  • Objective: Find an equivalent simpler proposition.
  • Key Operators: Conditional (), Negation (), and Conjunction ().

The Conditional Identity

  • Recall the identity:
  • In our case:
  • Let
  • Let

Applying the Identity

  • Substituting into the identity:

De Morgan's Law

  • Focus on the term:
  • Apply De Morgan's Law:

Applying De Morgan's Law

  • Here and
  • So,

Double Negation Law

  • Using Double Negation Law:
  • Therefore, the inner part simplifies to:

Associative Law

  • Substitute the simplified inner part back:
  • Notice that all operators are now (OR).
  • Apply Associative Law:

Idempotent Law

  • Apply Idempotent Law:
  • So,

Final Result

  • Final simplified expression:
  • Comparing with options:
  • Option 4: is Correct.

The Sigma Insight: Types of Sets and Set Operations

Solution Diagram

Analyzing the Setup

Welcome, future engineers! Today, we are going to peel back the layers of a fundamental problem in mathematical reasoning. Logic is the language of the universe, and mastering it is the first step toward mastering the complexities of computer science and advanced mathematics.
Let's look at the expression . At first glance, it might look like a jumble of symbols, but I want you to see it as a puzzle waiting to be solved.

The Conditional Barrier

Our first step is to tackle the conditional operator, the 'implies' sign. We know that is logically equivalent to . This is our golden key.
By applying this, we transform our expression into:
This step is crucial because it converts a complex implication into a simple disjunction, which is much easier to manipulate.

The De Morgan's Dance

Now, we encounter the negation of a conjunction. This is where De Morgan's Law shines. When we distribute that negation, the 'and' operator flips into an 'or'.
This gives us:
Don't make a silly mistake here; the negation distributes to both terms, and the operator changes. This is the heart of logical transformation.

The Final Simplification

Finally, we use the double negation law to simplify to . We are left with .
Since all operators are now 'or' (), we can use the Associative and Idempotent laws. The Associative law allows us to regroup the terms as .
Then, the Idempotent law tells us that is just . Thus, the entire expression simplifies beautifully to:
It is elegant, it is precise, and it is the foundation of logical deduction. Keep practicing these laws, and you will find that even the most daunting expressions become simple and clear.

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