Set - a collection of well defined and distinct objects, ø or ❴ ❵ - Null set or empty set, ∈ - is an element of, ∉ - is not an element of, # - Cardinal Number (number of elements in a set), True. - 6 ∈ ℕ, False - B = ❴1, 4, 9, 16, 25, 36 ❵. 61 ∈ B.,

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