Guys please help A= {{1} ,2,3,4} what does it mean.
I mean does {1} belong to A and is it a subset please answer whatever u know to make me understand !
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it means that {1} ∈ A
that is, {1} is an element of A.
{{1}} is a subset of A.
but {1} isn't a subset of A, since, 1 ∉ A.
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