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If f(x1) = f(x2) always implies x1 = x2, then f is
AOne-one (injective map)
BOnto (surjective map)
CConstant (one value only)
DMany-one (not injective)
Answer & Solution
Correct answer: A. One-one (injective map)
Distinct inputs never share an output exactly when the function is one-one, also called injective.
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