Q17Short answer
For all sets A, B and C, if A ⊂ C and B ⊂ C, then A ∪ B ⊂ C. Using properties of sets prove the statements given in Exercises 18 to 22
For all sets A, B and C, if A ⊂ C and B ⊂ C, then A ∪ B ⊂ C. Using properties of sets prove the statements given in Exercises 18 to 22