Set Theory

JKSSB Finance Accounts Assistant · Mathematics · 15 practice questions with answers and explanations: 4 Easy, 6 Medium, 5 Hard.

Sample questions

Sample Easy question 1

What symbol represents the intersection of two sets?

  1. ∩
  2. ∪
  3. ⊆
  4. ∈
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Answer: A. The intersection symbol ∩ represents elements common to both sets.

Sample Medium question 2

According to De Morgan's law, (A ∪ B)′ equals:

  1. A′ ∪ B′
  2. A ∩ B
  3. A′ ∩ B′
  4. A′ − B′
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Answer: C. The complement of a union is the intersection of the complements: (A ∪ B)′ = A′ ∩ B′.

Sample Hard question 3

What does A ⊆ B mean?

  1. Every element of A is also an element of B
  2. A and B have no common elements
  3. A and B are equal
  4. A has more elements than B
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Answer: A. A ⊆ B means A is a subset of B: every element of A belongs to B.

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