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Formal Definition

Sets are Disjoint if no two of them have any element in common.

Informal Definition

Disjoint sets do not share any elements


$\{A,B,C\}$and $\{D,E,F\}$ would be Disjoint as they have no elements in common


$\{1,2,3\}$ and $\{3,4,5\}$ would not be Disjoint as they have the element $3$ in common

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