Let A {a, b}, B {a, b, c}. Is A ⊂ B? What is A ∪ B? contexto.140 3 years ago Solution: Provided that: A {a, b} and B {a, b, c} Yes, A ⊂ B Therefore the union of the pairs of set can be re-written as A ∪ B {a, b, c} B