A collection of well defined object is called, set, equation, graph, wave, A set containing only one element is called, finite set, singleton set, universal set, complementary set, All these are types of sets except, equal sets, empty set, subsets, cubic, The collection of elements common to two or more intersecting sets is called, union of sets, cardinality of set, Intersection of sets, power of set, which of these is a subset of U = {1,2,3,4,5,6,7,8,9}, {1,2,3}, {7,9,12}, {9,10,11}, {5,9,14}

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