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Let A = {1, 2, {3, 4}, 5}. Which of the following is true?

Posted: Wed Jul 13, 2022 8:09 pm
by answerhappygod
a) {3, 4} ⊂ A
b) {3, 4} ∈ A
c) {{3, 4}} ⊂ A
d) {1, 2, 5} ⊂ A