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Sets and Functions
Let A = {ϕ, {ϕ}, 1, {1, ϕ}, 7}. Which of the following is false?
ϕ ∈ A
{ϕ} ∈ A
{1} ∈ A
{7, ϕ,} ⊂ A
Correct Answer:
{1} ∈ A
Explanation:
NA
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