Answer: Every element of B has at least one pre-image.
- A Every element of A maps to a unique image in B
- B Every element of B has at least one pre-image
- C f is one-one, meaning distinct inputs give distinct outputs
- D f(a) = a holds true for every single value of a
Correct answer: B. Every element of B has at least one pre-image
Explanation: Surjective (onto) means every element in the codomain B has at least one element in A mapping to it.
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.