Set Theory · Introduction

Lesson 5

Nikolai Chukhin · Alexander S. Kulikov

Problem. Let \[\begin{align*}A&=\{7, 2, 3, 4, 5\},\\ B&=\{3, A, \varnothing\}.\end{align*}\] Mark all correct statements.

This problem can only be submitted at Cogniterra.

  1. \(\varnothing \subseteq A\)

  2. \(\varnothing \subseteq B\)

  3. \(\varnothing \in A\)

  4. \(\varnothing \in B\)

  5. \(A \subseteq B\)

  6. \(A \in B\)

  7. \(7 \in A\)

  8. \(7 \in B\)