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Function f: A → B is onto (surjective) if:

AEvery b ∈ B is image of some a ∈ A
BRandom
CEmpty
DAlways
Answer & Solution
Correct answer: A. Every b ∈ B is image of some a ∈ A
**Surjection (onto):** range = codomain. Every element of B has at least one preimage. Bijection = injective + surjective.
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