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Mathematics for IGCSE & O level - Sets (Section 2 - No. 36)
Which of the following is the correct way to represent 'x is not an element of set A'?
x ∈ A
x ∉ A
A ⊆ x
A ⊇ x
解释
The symbol '∉' is used to represent 'is not an element of'.
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