Answer: Range of f equals B.
- A A has more elements than B
- B Range of f equals B
- C f(x₁) = f(x₂) implies x₁ = x₂
- D f is its own inverse
Correct answer: B. Range of f equals B
Explanation: Surjectivity means every element of the codomain is actually attained.
Concept context
Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions