Practice Part B: Symmetric, Anti-Symmetric and Irreflexive Relations - 21.5.2 | 21. Lecture -20 | Discrete Mathematics - Vol 1
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Practice Questions

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Question 1

Easy

Define a symmetric relation in your own words.

💡 Hint: Think about how relationships often work in pairs.

Question 2

Easy

What is an example of an irreflexive relation?

💡 Hint: Consider numerical comparisons where one number can’t equal itself.

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Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What defines a symmetric relation?

  • If (a
  • b) implies (b
  • a)
  • If (a
  • b) implies b > a
  • If (a
  • b) implies (a
  • a)

💡 Hint: What would happen if you reversed the pairs in a relationship?

Question 2

True or False: An anti-symmetric relation can have (a, a) and (b, b) without issue.

  • True
  • False

💡 Hint: Consider the definition of anti-symmetry carefully.

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Challenge Problems

Push your limits with challenges.

Question 1

Given a set A = {a, b, c}, construct all possible relations and categorize them by symmetry, anti-symmetry, and irreflexivity.

💡 Hint: Use the definition of each type to guide your categorization.

Question 2

Prove that a symmetric relation on a set can never be irreflexive.

💡 Hint: Start with the definitions of symmetric and irreflexive relations.

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