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1 September, 22:40

What is n (A) and n (B) in sets lesson?

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  1. 1 September, 23:05
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    Set membership x ∈ X means x is an element of the set X ... The set of natural numbers N has elements 0,1,2,3, ... Intersection X ∩ Y is defined by: x ∈ X ∩ Y if and only if x ∈ X and x ∈ Y.
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